diff --git a/README.md b/README.md
index 7036f25d7..6985bb73b 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,9 @@ To start javascript assignments please follow the next steps:
   git commit -m "Update the links"
   git push origin master
 ```
-* Open https://github.com/AisBrestEDU/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
+
+* Open https://github.com/lenivecc/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
+
 
 
 ### How to setup work environment
diff --git a/package-lock.json b/package-lock.json
index c87f25cb9..28662d128 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "dev": true,
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+
     }
   }
 }
diff --git a/package.json b/package.json
index 1830b3015..1d56e228f 100644
--- a/package.json
+++ b/package.json
@@ -20,5 +20,8 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/rolling-scopes-school/js-assignments.git"
+  },
+  "dependencies": {
+    "co": "^4.6.0"
   }
 }
diff --git a/task/01-strings-tasks.js b/task/01-strings-tasks.js
deleted file mode 100644
index e28054657..000000000
--- a/task/01-strings-tasks.js
+++ /dev/null
@@ -1,290 +0,0 @@
-'use strict';
-
-/********************************************************************************************
- *                                                                                          *
- * Plese read the following tutorial before implementing tasks:                             *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String  *
- *                                                                                          *
- ********************************************************************************************/
-
-
-
-/**
- * Returns the result of concatenation of two strings.
- *
- * @param {string} value1
- * @param {string} value2
- * @return {string}
- *
- * @example
- *   'aa', 'bb' => 'aabb'
- *   'aa',''    => 'aa'
- *   '',  'bb'  => 'bb'
- */
-function concatenateStrings(value1, value2) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the length of given string.
- *
- * @param {string} value
- * @return {number}
- *
- * @example
- *   'aaaaa' => 5
- *   'b'     => 1
- *   ''      => 0
- */
-function getStringLength(value) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns the result of string template and given parameters firstName and lastName.
- * Please do not use concatenation, use template string :
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings
- *
- * @param {string} firstName
- * @param {string} lastName
- * @return {string}
- *
- * @example
- *   'John','Doe'      => 'Hello, John Doe!'
- *   'Chuck','Norris'  => 'Hello, Chuck Norris!'
- */
-function getStringFromTemplate(firstName, lastName) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Extracts a name from template string 'Hello, First_Name Last_Name!'.
- *
- * @param {string} value
- * @return {string}
- *
- * @example
- *   'Hello, John Doe!' => 'John Doe'
- *   'Hello, Chuck Norris!' => 'Chuck Norris'
- */
-function extractNameFromTemplate(value) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns a first char of the given string.
- *
- * @param {string} value
- * @return {string}
- *
- * @example
- *   'John Doe'  => 'J'
- *   'cat'       => 'c'
- */
-function getFirstChar(value) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Removes a leading and trailing whitespace characters from string.
- *
- * @param {string} value
- * @return {string}
- *
- * @example
- *   '  Abracadabra'    => 'Abracadabra'
- *   'cat'              => 'cat'
- *   '\tHello, World! ' => 'Hello, World!'
- */
-function removeLeadingAndTrailingWhitespaces(value) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns a string that repeated the specified number of times.
- *
- * @param {string} value
- * @param {string} count
- * @return {string}
- *
- * @example
- *   'A', 5  => 'AAAAA'
- *   'cat', 3 => 'catcatcat'
- */
-function repeatString(value, count) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Remove the first occurrence of string inside another string
- * 
- * @param {string} str
- * @param {string} value
- * @return {string}
- *
- * @example
- *   'To be or not to be', 'not'  => 'To be or to be'
- *   'I like legends', 'end' => 'I like legs',
- *   'ABABAB','BA' => 'ABAB'
- */
-function removeFirstOccurrences(str, value) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Remove the first and last angle brackets from tag string
- *
- * @param {string} str
- * @return {string}
- *
- * @example
- *   '<div>' => 'div'
- *   '<span>' => 'span'
- *   '<a>' => 'a'
- */
-function unbracketTag(str) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Converts all characters of the specified string into the upper case
- *
- * @param {string} str
- * @return {string}
- *
- * @example
- *   'Thunderstruck' => 'THUNDERSTRUCK'
- *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
- */
-function convertToUpperCase(str) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Extracts e-mails from single string with e-mails list delimeted by semicolons
- *
- * @param {string} str
- * @return {array}
- *
- * @example
- *   'angus.young@gmail.com;brian.johnson@hotmail.com;bon.scott@yahoo.com' => ['angus.young@gmail.com', 'brian.johnson@hotmail.com', 'bon.scott@yahoo.com']
- *   'info@gmail.com' => ['info@gmail.com']
- */
-function extractEmails(str) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns the string representation of rectangle with specified width and height
- * using pseudograhic chars
- *
- * @param {number} width
- * @param {number} height
- * @return {string}
- *
- * @example
- *
- *            '┌────┐\n'+
- *  (6,4) =>  '│    │\n'+
- *            '│    │\n'+
- *            '└────┘\n'
- *
- *  (2,2) =>  '┌┐\n'+
- *            '└┘\n'
- *
- *             '┌──────────┐\n'+
- *  (12,3) =>  '│          │\n'+
- *             '└──────────┘\n'
- *
- */
-function getRectangleString(width, height) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Encode specified string with ROT13 cipher
- * See details:  https://en.wikipedia.org/wiki/ROT13
- *
- * @param {string} str
- * @return {string}
- *
- * @example
- *
- *   'hello' => 'uryyb'
- *   'Why did the chicken cross the road?' => 'Jul qvq gur puvpxra pebff gur ebnq?'
- *   'Gb trg gb gur bgure fvqr!' => 'To get to the other side!'
- *   'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' => 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm'
- *
- */
-function encodeToRot13(str) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns true if the value is string; otherwise false.
- * @param {string} value
- * @return {boolean}
- *
- * @example
- *   isString() => false
- *   isString(null) => false
- *   isString([]) => false
- *   isString({}) => false
- *   isString('test') => true
- *   isString(new String('test')) => true
- */
-function isString(value) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns playid card id.
- * 
- * Playing cards inittial deck inclides the cards in the following order:
- * 
- *  'A♣','2♣','3♣','4♣','5♣','6♣','7♣','8♣','9♣','10♣','J♣','Q♣','K♣',
- *  'A♦','2♦','3♦','4♦','5♦','6♦','7♦','8♦','9♦','10♦','J♦','Q♦','K♦',
- *  'A♥','2♥','3♥','4♥','5♥','6♥','7♥','8♥','9♥','10♥','J♥','Q♥','K♥',
- *  'A♠','2♠','3♠','4♠','5♠','6♠','7♠','8♠','9♠','10♠','J♠','Q♠','K♠'
- * 
- * (see https://en.wikipedia.org/wiki/Standard_52-card_deck)
- * Function returns the zero-based index of specified card in the initial deck above.
- * 
- * @param {string} value
- * @return {number}
- *
- * @example
- *   'A♣' => 0
- *   '2♣' => 1 
- *   '3♣' => 2
- *     ...
- *   'Q♠' => 50
- *   'K♠' => 51
- */
-function getCardId(value) {
-    throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    concatenateStrings: concatenateStrings,
-    getStringLength: getStringLength,
-    getStringFromTemplate: getStringFromTemplate,
-    extractNameFromTemplate: extractNameFromTemplate,
-    getFirstChar: getFirstChar,
-    removeLeadingAndTrailingWhitespaces: removeLeadingAndTrailingWhitespaces,
-    repeatString: repeatString,
-    removeFirstOccurrences: removeFirstOccurrences,
-    unbracketTag: unbracketTag,
-    convertToUpperCase: convertToUpperCase,
-    extractEmails: extractEmails,
-    getRectangleString: getRectangleString,
-    encodeToRot13: encodeToRot13,
-    isString: isString,
-    getCardId: getCardId
-};
diff --git a/task/02-numbers-tasks.js b/task/02-numbers-tasks.js
deleted file mode 100644
index c9ed20208..000000000
--- a/task/02-numbers-tasks.js
+++ /dev/null
@@ -1,240 +0,0 @@
-'use strict';
-
-/********************************************************************************************
- *                                                                                          *
- * Plese read the following tutorial before implementing tasks:                             *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Numbers_and_dates          *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number  *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math    *
- *                                                                                          *
- ********************************************************************************************/
-
-
-/**
- * Returns an area of a rectangle given by width and heigth.
- *
- * @param {numder} width
- * @param {number} height
- * @return {number}
- *
- * @example:
- *   5, 10 => 50
- *   5, 5  => 25
- */
-function getRectangleArea(width, height) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns a circumference of circle given by radius.
- *
- * @param {number} radius
- * @return {number}
- *
- * @example:
- *   5    => 31.41592653589793
- *   3.14 => 19.729201864543903
- *   0    => 0
- */
-function getCicleCircumference(radius) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns an average of two given numbers.
- *
- * @param {numder} value1
- * @param {number} value2
- * @return {number}
- *
- * @example:
- *   5, 5  => 5
- *  10, 0  => 5
- *  -3, 3  => 0
- */
-function getAverage(value1, value2) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns a distance beetween two points by cartesian coordinates.
- *
- * @param {number} x1
- * @param {number} y1
- * @param {number} x2
- * @param {number} y2
- *
- * @return {number}
- *
- * @example:
- *   (0,0) (0,1)    => 1
- *   (0,0) (1,0)    => 1
- *   (-5,0) (10,-10) => 18.027756377319946
- */
-function getDistanceBetweenPoints(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns a root of linear equation a*x + b = 0 given by coefficients a and b.
- *
- * @param {number} a
- * @param {number} b
- * @return {number}
- *
- * @example:
- *   5*x - 10 = 0    => 2
- *   x + 8 = 0       => -8
- *   5*x = 0         => 0
- */
-function getLinearEquationRoot(a, b) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns an angle (in radians) between two vectors given by xi and yi, coordinates in Cartesian plane
- * See details https://en.wikipedia.org/wiki/Euclidean_vector#Representations
- *
- * @param {number} x1
- * @param {number} y1
- * @param {number} x2
- * @param {number} y2
- * @return {number}
- *
- * @example:
- *   (1,0) (0,1)     => π/2
- *   (0,1) (0,-1)    => π
- *   (0,-1) (1,0)    => π/2
- *   (0,1) (0,1)     => 0
- *   (0,1) (1,2)     => 0
- */
-function getAngleBetweenVectors(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns a last digit of a integer number.
- *
- * @param {number} value
- * @return {number}
- *
- * @example:
- *   100     => 0
- *    37     => 7
- *     5     => 5
- *     0     => 0
- */
-function getLastDigit(value) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns a number by given string representation.
- *
- * @param {string} value
- * @return {number}
- *
- * @example:
- *    '100'     => 100
- *     '37'     => 37
- * '-525.5'     => -525.5
- */
-function parseNumberFromString(value) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns a diagonal length of the rectangular parallelepiped given by its sides a,b,c.
- *
- * @param {number} a
- * @param {number} b
- * @param {number} c
- * @return {number}
- *
- * @example:
- *   1,1,1   => 1.7320508075688772
- *   3,3,3   => 5.196152422706632
- *   1,2,3   => 3.741657386773941
- */
-function getParallelipidedDiagonal(a,b,c) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns the number rounded to specified power of 10.
- *
- * @param {number} num
- * @param {number} pow
- * @return {number}
- *  
- * @example:
- *   1234, 0  => 1234
- *   1234, 1  => 1230
- *   1234, 2  => 1200
- *   1234, 3  => 1000
- *   1678, 0  => 1678
- *   1678, 1  => 1680
- *   1678, 2  => 1700
- *   1678, 3  => 2000
- */
-function roundToPowerOfTen(num, pow) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Returns true is the number is prime; otherwise false.
- * See: https://en.wikipedia.org/wiki/Primality_test
- *
- * @param {number} n
- * @return {bool}
- * 
- * @example:
- *   4 => false
- *   5 => true
- *   6 => false
- *   7 => true
- *   11 => true
- *   12 => false
- *   16 => false
- *   17 => true
- */
-function isPrime(n) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Tries to convert value to number and returns it if conversion was successfull;
- * otherwise returns default value passed as a second argument.
- *
- * @param {any} value
- * @param {any} def
- * @return {number}
- *
- * @example
- *   toNumber(null, 0) => 0
- *   toNumber('test', 0) => 0
- *   toNumber('1', 0) => 1
- *   toNumber(42, 0) => 42
- *   toNumber(new Number(42), 0) => 42
- */
-function toNumber(value, def) {
-    throw new Error('Not implemented');
-}
-
-module.exports = {
-    getRectangleArea: getRectangleArea,
-    getCicleCircumference: getCicleCircumference,
-    getAverage: getAverage,
-    getDistanceBetweenPoints: getDistanceBetweenPoints,
-    getLinearEquationRoot: getLinearEquationRoot,
-    getAngleBetweenVectors: getAngleBetweenVectors,
-    getLastDigit: getLastDigit,
-    parseNumberFromString: parseNumberFromString,
-    getParallelipidedDiagonal: getParallelipidedDiagonal,
-    roundToPowerOfTen: roundToPowerOfTen,
-    isPrime: isPrime,
-    toNumber: toNumber
-};
diff --git a/task/03-date-tasks.js b/task/03-date-tasks.js
deleted file mode 100644
index 83c6266bc..000000000
--- a/task/03-date-tasks.js
+++ /dev/null
@@ -1,107 +0,0 @@
-'use strict';
-
-/********************************************************************************************
- *                                                                                          *
- * Plese read the following tutorial before implementing tasks:                             *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Numbers_and_dates#Date_object
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date    *
- *                                                                                          *
- ********************************************************************************************/
-
-
-/**
- * Parses a rfc2822 string date representation into date value
- * For rfc2822 date specification refer to : http://tools.ietf.org/html/rfc2822#page-14
- *
- * @param {string} value
- * @return {date}
- *
- * @example:
- *    'December 17, 1995 03:24:00'    => Date()
- *    'Tue, 26 Jan 2016 13:48:02 GMT' => Date()
- *    'Sun, 17 May 1998 03:00:00 GMT+01' => Date()
- */
-function parseDataFromRfc2822(value) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Parses an ISO 8601 string date representation into date value
- * For ISO 8601 date specification refer to : https://en.wikipedia.org/wiki/ISO_8601
- *
- * @param {string} value
- * @return {date}
- *
- * @example :
- *    '2016-01-19T16:07:37+00:00'    => Date()
- *    '2016-01-19T08:07:37Z' => Date()
- */
-function parseDataFromIso8601(value) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns true if specified date is leap year and false otherwise
- * Please find algorithm here: https://en.wikipedia.org/wiki/Leap_year#Algorithm
- *
- * @param {date} date
- * @return {bool}
- *
- * @example :
- *    Date(1900,1,1)    => false
- *    Date(2000,1,1)    => true
- *    Date(2001,1,1)    => false
- *    Date(2012,1,1)    => true
- *    Date(2015,1,1)    => false
- */
-function isLeapYear(date) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the string represention of the timespan between two dates.
- * The format of output string is "HH:mm:ss.sss"
- *
- * @param {date} startDate
- * @param {date} endDate
- * @return {string}
- *
- * @example:
- *    Date(2000,1,1,10,0,0),  Date(2000,1,1,11,0,0)   => "01:00:00.000"
- *    Date(2000,1,1,10,0,0),  Date(2000,1,1,10,30,0)       => "00:30:00.000"
- *    Date(2000,1,1,10,0,0),  Date(2000,1,1,10,0,20)        => "00:00:20.000"
- *    Date(2000,1,1,10,0,0),  Date(2000,1,1,10,0,0,250)     => "00:00:00.250"
- *    Date(2000,1,1,10,0,0),  Date(2000,1,1,15,20,10,453)   => "05:20:10.453"
- */
-function timeSpanToString(startDate, endDate) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the angle (in radians) between the hands of an analog clock for the specified Greenwich time.
- * If you have problem with solution please read: https://en.wikipedia.org/wiki/Clock_angle_problem
- * 
- * @param {date} date
- * @return {number}
- *
- * @example:
- *    Date.UTC(2016,2,5, 0, 0) => 0
- *    Date.UTC(2016,3,5, 3, 0) => Math.PI/2
- *    Date.UTC(2016,3,5,18, 0) => Math.PI
- *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
- */
-function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    parseDataFromRfc2822: parseDataFromRfc2822,
-    parseDataFromIso8601: parseDataFromIso8601,
-    isLeapYear: isLeapYear,
-    timeSpanToString: timeSpanToString,
-    angleBetweenClockHands: angleBetweenClockHands
-};
diff --git a/task/04-arrays-tasks.js b/task/04-arrays-tasks.js
deleted file mode 100644
index ff3a4c019..000000000
--- a/task/04-arrays-tasks.js
+++ /dev/null
@@ -1,598 +0,0 @@
-'use strict';
-
-/*********************************************************************************************
- *                                                                                           *
- * Plese read the following tutorial before implementing tasks:                              *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array    *
- *                                                                                           *
- * NOTE : Please do not use loops! All tasks can be implmeneted using standard Array methods *
- *                                                                                           *
- *********************************************************************************************/
-
- 
-/**
- * Returns an index of the specified element in array or -1 if element is not found
- * 
- * @param {array} arr
- * @param {any} value
- * @return {number}
- * 
- * @example
- *    ['Ace', 10, true], 10    => 1 
- *    ['Array', 'Number', 'string'], 'Date'    => -1 
- *    [0, 1, 2, 3, 4, 5], 5    => 5
- */
-function findElement(arr, value) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Generates an array of odd numbers of the specified length
- * 
- * @param {number} len
- * @return {array}
- * 
- * @example
- *    1 => [ 1 ] 
- *    2 => [ 1, 3 ] 
- *    5 => [ 1, 3, 5, 7, 9 ]
- */
-function generateOdds(len) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the doubled array - elements of the specified array are repeated twice using original order
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    ['Ace', 10, true]  => ['Ace', 10, true,   'Ace', 10, true]  
- *    [0, 1, 2, 3, 4, 5] => [0, 1, 2, 3, 4, 5,   0, 1, 2, 3, 4, 5]
- *    [] => [] 
- */
-function doubleArray(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns an array of positive numbers from the specified array in original order
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [ 0, 1, 2, 3, 4, 5 ] => [ 1, 2, 3, 4, 5 ]
- *    [-1, 2, -5, -4, 0] => [ 2 ]
- *    [] => [] 
- */
-function getArrayOfPositives(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns the array with strings only in the specified array (in original order)
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [ 0, 1, 'cat', 3, true, 'dog' ] => [ 'cat', 'dog' ]
- *    [ 1, 2, 3, 4, 5 ] => []
- *    [ 'cat, 'dog', 'raccon' ] => [ 'cat', 'dog', 'racoon' ]
- */
-function getArrayOfStrings(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Removes falsy values from the specified array
- * Falsy values: false, null, 0, "", undefined, and NaN.
- * (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean#Description)
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [ 0, false, 'cat', NaN, true, '' ] => [ 'cat', true ]
- *    [ 1, 2, 3, 4, 5, 'false' ]         => [ 1, 2, 3, 4, 5, 'false' ]
- *    [ false, 0, NaN, '', undefined ]   => [ ]
- */
-function removeFalsyValues(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns the array of useprcase strings from the specified array
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [ 'permanent-internship', 'glutinous-shriek', 'multiplicative-elevation' ] => [ 'PERMANENT-INTERNSHIP', 'GLUTINOUS-SHRIEK', 'MULTIPLICATIVE-ELEVATION' ]
- *    [ 'a', 'b', 'c', 'd', 'e', 'f', 'g' ]  => [ 'A', 'B', 'C', 'D', 'E', 'F', 'G' ]
- */
-function getUpperCaseStrings(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the array of string lengths from the specified string array.
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [ '', 'a', 'bc', 'def', 'ghij' ]  => [ 0, 1, 2, 3, 4 ]
- *    [ 'angular', 'react', 'ember' ] => [ 7, 5, 5 ]
- */
-function getStringsLength(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Inserts the item into specified array at specified index
- * 
- * @param {array} arr
- * @param {any} item
- * @param {number} index 
- * 
- * @example
- *    [ 1, 3, 4, 5 ], 2, 1  => [ 1, 2, 3, 4, 5 ]
- *    [ 1, 'b', 'c'], 0, 'x'  => [ 'x', 1, 'b', 'c' ]
- */
-function insertItem(arr, item, index) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns the n first items of the specified array
- * 
- * @param {array} arr
- * @param {number} n 
- * 
- * @example
- *    [ 1, 3, 4, 5 ], 2  => [ 1, 2 ]
- *    [ 'a', 'b', 'c', 'd'], 3  => [ 'a', 'b', 'c' ]
- */
-function getHead(arr, n) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the n last items of the specified array
- * 
- * @param {array} arr
- * @param {number} n 
- * 
- * @example
- *    [ 1, 3, 4, 5 ], 2  => [ 4, 5 ]
- *    [ 'a', 'b', 'c', 'd'], 3  => [ 'b', 'c', 'd' ]
- */
-function getTail(arr, n) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns CSV represebtation of two-dimentional numeric array.
- * https://en.wikipedia.org/wiki/Comma-separated_values
- * 
- * @param {array} arr
- * @return {string}
- * 
- * @example
- *    [
- *       [  0, 1, 2, 3, 4 ],
- *       [ 10,11,12,13,14 ],
- *       [ 20,21,22,23,24 ],
- *       [ 30,31,32,33,34 ]
- *    ] 
- *           => 
- *     '0,1,2,3,4\n'
- *    +'10,11,12,13,14\n'
- *    +'20,21,22,23,24\n'
- *    +'30,31,32,33,34'
- */
-function toCsvText(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Transforms the numeric array into the according array of squares:
- *   f(x) = x * x
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *   [ 0, 1, 2, 3, 4, 5 ] => [ 0, 1, 4, 9, 16, 25 ]
- *   [ 10, 100, -1 ]      => [ 100, 10000, 1 ]
- */
-function toArrayOfSquares(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Transforms the numeric array to the according moving sum array:
- *     f[n] = x[0] + x[1] + x[2] +...+ x[n] 
- *  or f[n] = f[n-1] + x[n]
- * 
- * @param {array} arr
- * @return {array}
- * 
- * Example :
- *   [ 1, 1, 1, 1, 1 ]        => [ 1, 2, 3, 4, 5 ]
- *   [ 10, -10, 10, -10, 10 ] => [ 10, 0, 10, 0, 10 ]
- *   [ 0, 0, 0, 0, 0]         => [ 0, 0, 0, 0, 0] 
- *   [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] => [ 1, 3, 6, 10, 15, 21, 28, 36, 45, 55 ]
- */
-function getMovingSum(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns every second item from the specified array:
- * 
- * @param {array} arr
- * @return {array}
- * 
- * Example :
- * [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] => [ 2, 4, 6, 8, 10 ]
- * [ 'a', 'b', 'c' , null ]  => [ "b", null ]
- * [ "a" ] => []
- */
-function getSecondItems(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Propagates every item in sequence its position times
- * Returns an array that consists of: one first item, two second items, tree third items etc. 
- * 
- * @param {array} arr 
- * @return {array}
- * 
- * @example :
- *  [] => []
- *  [ 1 ] => [ 1 ]
- *  [ 'a', 'b' ] => [ 'a', 'b','b' ]
- *  [ 'a', 'b', 'c', null ] => [ 'a', 'b','b', 'c','c','c',  null,null,null,null ]
- *  [ 1,2,3,4,5 ] => [ 1, 2,2, 3,3,3, 4,4,4,4, 5,5,5,5,5 ]
- */
-function propagateItemsByPositionIndex(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/** 
- * Returns the 3 largest numbers from the specified array
- * 
- * @param {array} arr
- * @return {array}
- *
- * @example
- *   [] => []
- *   [ 1, 2 ] => [ 2, 1 ]
- *   [ 1, 2, 3 ] => [ 3, 2, 1 ]
- *   [ 1,2,3,4,5,6,7,8,9,10 ] => [ 10, 9, 8 ]
- *   [ 10, 10, 10, 10 ] => [ 10, 10, 10 ]
- */
-function get3TopItems(arr) {
-   throw new Error('Not implemented');
-}
- 
- 
-/**  
- * Returns the number of positive numbers from specified array
- * 
- * @param {array} arr
- * @return {number}
- * 
- * @example
- *   [ ]          => 0
- *   [ -1, 0, 1 ] => 1
- *   [ 1, 2, 3]   => 3
- *   [ null, 1, 'elephant' ] => 1
- *   [ 1, '2' ] => 1
- */
-function getPositivesCount(arr) {
-   throw new Error('Not implemented');
-}
- 
-/** 
- * Sorts digit names
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *   [] => []
- *   [ 'nine','one' ]                 => [ 'one', 'nine' ]
- *   [ 'one','two','three' ]          => [ 'one','two', 'three' ]
- *   [ 'nine','eight','nine','eight'] => [ 'eight','eight','nine','nine']
- *   [ 'one','one','one','zero' ]     => [ 'zero','one','one','one' ]
- */
-function sortDigitNamesByNumericOrder(arr) {
-   throw new Error('Not implemented');
-}
-
-/** 
- * Returns the sum of all items in the specified array of numbers
- * 
- * @param {array} arr
- * @return {number}
- * 
- * @example
- *   [] => 0
- *   [ 1, 2, 3 ]           => 6
- *   [ -1, 1, -1, 1 ]      => 0
- *   [ 1, 10, 100, 1000 ]  => 1111
- */
-function getItemsSum(arr) {
-   throw new Error('Not implemented');
-}
- 
-/** 
- * Returns the number of all falsy value in the specified array
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *  [] => 0
- *  [ 1, '', 3 ] => 1
- *  [ -1, 'false', null, 0 ] => 2
- *  [ null, undefined, NaN, false, 0, '' ]  => 6
- */
-function getFalsyValuesCount(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns a number of all occurences of the specified item in an array  
- * 
- * @param {array} arr
- * @param {any} item 
- * @return {number}
- * 
- * @example
- *    [ 0, 0, 1, 1, 1, 2 ], 1 => 3
- *    [ 1, 2, 3, 4, 5 ], 0 => 0
- *    [ 'a','b','c','c' ], 'c'=> 2
- *    [ null, undefined, null ], null => 2 
- *    [ true, 0, 1, 'true' ], true => 1
- */
-function findAllOccurences(arr, item) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Concatenates all elements from specified array into single string with ',' delimeter  
- * 
- * @param {array} arr 
- * @return {string}
- * 
- * @example
- *    [0, false, 'cat', NaN, true, '']  => '0,false,cat,NaN,true,'
- *    [1, 2, 3, 4, 5]                   => '1,2,3,4,5'
- *    ['rock', 'paper', 'scissors']     => 'rock,paper,scissors'
- */
-function toStringList(arr) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Sorts the specified array by country name first and city name (if countries are equal) in ascending order.
- * 
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *    [
- *      { country: 'Russia',  city: 'Moscow' },
- *      { country: 'Belarus', city: 'Minsk' },
- *      { country: 'Poland',  city: 'Warsaw' },
- *      { country: 'Russia',  city: 'Saint Petersburg' },
- *      { country: 'Poland',  city: 'Krakow' },
- *      { country: 'Belarus', city: 'Brest' }
- *    ]  
- *                      =>
- *    [
- *      { country: 'Belarus', city: 'Brest' },
- *      { country: 'Belarus', city: 'Minsk' },
- *      { country: 'Poland',  city: 'Krakow' },
- *      { country: 'Poland',  city: 'Warsaw' },
- *      { country: 'Russia',  city: 'Moscow' },
- *      { country: 'Russia',  city: 'Saint Petersburg' }
- */
-function sortCitiesArray(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Creates an indentity matrix of the specified size
- * 
- * @param {number} n
- * @return {array}
- * 
- * @example
- *     1  => [[1]]
- *  
- *     2 => [[1,0],
- *           [0,1]]
- * 
- *          [[1,0,0,0,0],
- *           [0,1,0,0,0],
- *     5 =>  [0,0,1,0,0],
- *           [0,0,0,1,0],
- *           [0,0,0,0,1]]   
- */
-function getIdentityMatrix(n) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Creates an array of integers from the specified start to end (inclusive)
- * 
- * @param {number} start
- * @param {number} end
- * @return {array}
- * 
- * @example
- *     1, 5  => [ 1, 2, 3, 4, 5 ]
- *    -2, 2  => [ -2, -1, 0, 1, 2 ]
- *     0, 100 => [ 0, 1, 2, ..., 100 ]
- *     3, 3   => [ 3 ]
- */
-function getIntervalArray(start, end) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Returns array containing only unique values from the specified array.
- *
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *   [ 1, 2, 3, 3, 2, 1 ] => [ 1, 2, 3 ]
- *   [ 'a', 'a', 'a', 'a' ]  => [ 'a' ]
- *   [ 1, 1, 2, 2, 3, 3, 4, 4] => [ 1, 2, 3, 4]
- */
-function distinct(arr) {
-   throw new Error('Not implemented');
-}
-
-/**
- * Groups elements of the specified array by key.
- * Returns multimap of keys extracted from array elements via keySelector callback
- * and values extracted via valueSelector callback.
- * See: https://en.wikipedia.org/wiki/Multimap
- *
- * @param {array} array
- * @param {Function} keySelector
- * @param {Function} valueSelector
- * @return {Map}
- *
- * @example
- *   group([
- *      { country: 'Belarus', city: 'Brest' },
- *      { country: 'Russia', city: 'Omsk' },
- *      { country: 'Russia', city: 'Samara' },
- *      { country: 'Belarus', city: 'Grodno' },
- *      { country: 'Belarus', city: 'Minsk' },
- *      { country: 'Poland', city: 'Lodz' }
- *     ], 
- *     item => item.country, 
- *     item => item.city
- *   )
- *            => 
- *   Map {
- *    "Belarus" => ["Brest", "Grodno", "Minsk"],
- *    "Russia" => ["Omsk", "Samara"], 
- *    "Poland" => ["Lodz"]
- *   }
- */
-function group(array, keySelector, valueSelector) {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Projects each element of the specified array to a sequence and flattens the resulting sequences into one array.
- *
- * @param {array} arr
- * @param {Function} childrenSelector, a transform function to apply to each element that returns an array of children
- * @return {array}
- * 
- * @example
- *   [[1, 2], [3, 4], [5, 6]], (x) => x     =>   [ 1, 2, 3, 4, 5, 6 ]
- *   ['one','two','three'], x=>x.split('')  =>   ['o','n','e','t','w','o','t','h','r','e','e']
- */
-function selectMany(arr, childrenSelector) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns an element from the multidimentional array by the specified indexes.
- *
- * @param {array} arr
- * @param {array} indexes
- * @return {any} element from array
- * 
- * @example
- *   [[1, 2], [3, 4], [5, 6]], [0,0]  => 1        (arr[0][0]) 
- *   ['one','two','three'], [2]       => 'three'  (arr[2]) 
- *   [[[ 1, 2, 3]]], [ 0, 0, 1 ]      => 2        (arr[0][0][1])
- */
-function getElementByIndexes(arr, indexes) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Swaps the head and tail of the specified array:
- * the head (first half) of array move to the end, the tail (last half) move to the start. 
- * The middle element (if exists) leave on the same position.
- * 
- *  
- * @param {array} arr
- * @return {array}
- * 
- * @example
- *   [ 1, 2, 3, 4, 5 ]   =>  [ 4, 5, 3, 1, 2 ]
- *    \----/   \----/         
- *     head     tail 
- *
- *   [ 1, 2 ]  => [ 2, 1 ] 
- *   [ 1, 2, 3, 4, 5, 6, 7, 8 ]   =>  [ 5, 6, 7, 8, 1, 2, 3, 4 ]   
- * 
- */
-function swapHeadAndTail(arr) {
-    throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    findElement: findElement,
-    generateOdds: generateOdds,
-    doubleArray: doubleArray,
-    getArrayOfPositives: getArrayOfPositives,
-    getArrayOfStrings: getArrayOfStrings,
-    removeFalsyValues: removeFalsyValues,
-    getUpperCaseStrings: getUpperCaseStrings,
-    getStringsLength: getStringsLength,
-    insertItem: insertItem,
-    getHead: getHead,
-    getTail: getTail,
-    toCsvText: toCsvText,
-    toStringList: toStringList,
-    toArrayOfSquares: toArrayOfSquares,
-    getMovingSum: getMovingSum,
-    getSecondItems: getSecondItems,
-    propagateItemsByPositionIndex: propagateItemsByPositionIndex,
-    get3TopItems: get3TopItems,
-    getPositivesCount: getPositivesCount,
-    sortDigitNamesByNumericOrder: sortDigitNamesByNumericOrder,
-    getItemsSum: getItemsSum,
-    getFalsyValuesCount: getFalsyValuesCount,
-    findAllOccurences: findAllOccurences,
-    sortCitiesArray: sortCitiesArray,
-    getIdentityMatrix: getIdentityMatrix,
-    getIntervalArray: getIntervalArray,
-    distinct: distinct,
-    group: group,
-    selectMany: selectMany,
-    getElementByIndexes: getElementByIndexes,
-    swapHeadAndTail: swapHeadAndTail
-};
diff --git a/task/05-regex-tasks.js b/task/05-regex-tasks.js
deleted file mode 100644
index b1c60f2d4..000000000
--- a/task/05-regex-tasks.js
+++ /dev/null
@@ -1,129 +0,0 @@
-'use strict';
-
-/********************************************************************************************
- *                                                                                          *
- * Plese read the following tutorial before implementing tasks:                             *
- * https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions           *
- *                                                                                          *
- ********************************************************************************************/
-
-
-/**
- * Returns the regexp that matches a GUID string representation
- * '{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}',
- * where X is hexadecimal digit (0,1,2...,9,A,a,B,b,C,c,D,d,F,f)
- *
- * See more details: https://en.wikipedia.org/wiki/Globally_unique_identifier
- *
- * Match :
- *   '{3F2504E0-4F89-41D3-9A0C-0305E82C3301}'
- *   '{21EC2020-3AEA-4069-A2DD-08002B30309D}'
- *   '{0c74f13f-fa83-4c48-9b33-68921dd72463}'
- *
- *  Do not match:
- *   '{D44EF4F4-280B47E5-91C7-261222A59621}'
- *   '{D1A5279D-B27D-4CD4-A05E-EFDH53D08E8D}'
- *   '{5EDEB36C-9006-467A8D04-AFB6F62CD7D2}'
- *   '677E2553DD4D43B09DA77414DB1EB8EA'
- *   '0c74f13f-fa83-4c48-9b33-68921dd72463'
- *   'The roof, the roof, the roof is on fire'
- *
- * @return {RegExp}
- */
-function getRegexForGuid() {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the regexp that matches all the strings from first column
- * but of them from the second
- *
- * Match :                 Do not match:
- * -----------             --------------
- *  'pit'                     ' pt'
- *  'spot'                    'Pot'
- *  'spate'                   'peat'
- *  'slap two'                'part'
- *  'respite'
- *
- * NOTE : the regex lenth should be < 13
- *
- * @return {RegExp}
- *
- */
-function getRegexForPitSpot() {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the regexp that matches all IPv4 strings in
- * 'XX.XX.XX.XX' dotted format where XX is number 0 to 255
- *
- * Valid IPv4:                       Invalid IPv4
- * ---------------                  -----------------
- * '0.0.0.0'                         '300.0.0.0'
- * '127.0.0.1'                       '127.0.0.-1'
- * '10.10.1.1'                       '23.24.25.26.27'
- * '46.61.155.237'                   'Set dns to 8.8.8.8'
- * '010.234.015.001'
- *
- * @return {RegExp}
- */
-function getRegexForIPv4() {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the regexp that matches all SSN (Social Security Number) codes in
- * 'XXX-XX-XXXX' format where X is digit, where each group can't be all zeros
- * https://en.wikipedia.org/wiki/Social_Security_number
- *
- * Valid SSN:                       Invalid SSN
- * ---------------                  -----------------
- * '123-45-6789'                     '123456789'
- * '234-56-2349'                     '000-56-2349'
- * '875-43-0298'                     '875-00-0298'
- * '034-01-0008'                     '034-01-0000'
- *                                   '0S4-H1-HACK'
- * @return {RegExp}
- */
-function getRegexForSSN() {
-   throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the password validator regex.
- * Regex will validate a password to make sure it meets the follwing criteria:
- *  - At least specified characters long (argument minLength)
- *  - Contains a lowercase letter
- *  - Contains an uppercase letter
- *  - Contains a number
- *  - Valid passwords will only be alphanumeric characters.
- *
- * @param {number} minLength
- * @return {Regex}
- *
- * @example
- *   let validator = getPasswordValidator(6);
- *   'password'.match(validator)  => false
- *   'Pa55Word'.match(validator)  => true
- *   'PASSw0rd'.match(validator)  => true
- *   'PASSW0RD'.match(validator)  => false
- *   'Pa55'.match(validator) => false
- */
-function getPasswordValidator(minLength) {
-   throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    getRegexForGuid: getRegexForGuid,
-    getRegexForPitSpot: getRegexForPitSpot,
-    getRegexForIPv4: getRegexForIPv4,
-    getRegexForSSN: getRegexForSSN,
-    getPasswordValidator: getPasswordValidator
-};
diff --git a/task/06-conditions-n-loops-tasks.js b/task/06-conditions-n-loops-tasks.js
deleted file mode 100644
index 249194c34..000000000
--- a/task/06-conditions-n-loops-tasks.js
+++ /dev/null
@@ -1,457 +0,0 @@
-'use strict';
-
-/**************************************************************************************************
- *                                                                                                *
- * Plese read the following tutorial before implementing tasks:                                   *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling  *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration              *
- *                                                                                                *
- **************************************************************************************************/
-
-
-/**
- * Returns the 'Fizz','Buzz' or an original number using the following rules:
- * 1) return original number
- * 2) but if number multiples of three return 'Fizz'
- * 3) for the multiples of five return 'Buzz'
- * 4) for numbers which are multiples of both three and five return 'FizzBuzz'
- *
- * @param {number} num
- * @return {any}
- *
- * @example
- *   2 =>  2
- *   3 => 'Fizz'
- *   5 => 'Buzz'
- *   4 => 4
- *  15 => 'FizzBuzz'
- *  20 => 'Buzz'
- *  21 => 'Fizz'
- *
- */
-function getFizzBuzz(num) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the factorial of the specified integer n.
- *
- * @param {number} n
- * @return {number}
- *
- * @example:
- *   1  => 1
- *   5  => 120
- *   10 => 3628800
- */
-function getFactorial(n) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the sum of integer numbers between n1 and n2 (inclusive).
- *
- * @param {number} n1
- * @param {number} n2
- * @return {number}
- *
- * @example:
- *   1,2   =>  3  ( = 1+2 )
- *   5,10  =>  45 ( = 5+6+7+8+9+10 )
- *   -1,1  =>  0  ( = -1 + 0 + 1 )
- */
-function getSumBetweenNumbers(n1, n2) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns true, if a triangle can be built with the specified sides a,b,c and false in any other ways.
- *
- * @param {number} a
- * @param {number} b
- * @param {number} c
- * @return {bool}
- *
- * @example:
- *   1,2,3    =>  false
- *   3,4,5    =>  true
- *   10,1,1   =>  false
- *   10,10,10 =>  true
- */
-function isTriangle(a,b,c) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns true, if two specified axis-aligned rectangles overlap, otherwise false.
- * Each rectangle representing by object 
- *  {
- *     top: 5,
- *     left: 5,
- *     width: 20,
- *     height: 10
- *  }
- * 
- *  (5;5)
- *     -------------  
- *     |           | 
- *     |           |  height = 10
- *     ------------- 
- *        width=20    
- * 
- * NOTE: Please use canvas coordinate space (https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes#The_grid),
- * it differs from Cartesian coordinate system.
- * 
- * @param {object} rect1
- * @param {object} rect2
- * @return {bool}
- *
- * @example:
- *   { top: 0, left: 0, width: 10, height: 10 },
- *   { top: 5, left: 5, width: 20, height: 20 }    =>  true
- * 
- *   { top: 0, left: 0, width: 10, height: 10 },
- *   { top:20, left:20, width: 20, height: 20 }    =>  false
- *  
- */
-function doRectanglesOverlap(rect1, rect2) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns true, if point lies inside the circle, otherwise false.
- * Circle is an object of 
- *  {
- *     center: {
- *       x: 5,       
- *       y: 5
- *     },        
- *     radius: 20
- *  }
- * 
- * Point is object of 
- *  {
- *     x: 5,
- *     y: 5
- *  }
- * 
- * @param {object} circle
- * @param {object} point
- * @return {bool}
- *
- * @example:
- *   { center: { x:0, y:0 }, radius:10 },  { x:0, y:0 }     => true
- *   { center: { x:0, y:0 }, radius:10 },  { x:10, y:10 }   => false
- *   
- */
-function isInsideCircle(circle, point) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the first non repeated char in the specified strings otherwise returns null.
- *
- * @param {string} str
- * @return {string}
- *
- * @example:
- *   'The quick brown fox jumps over the lazy dog' => 'T'
- *   'abracadabra'  => 'c'
- *   'entente' => null
- */
-function findFirstSingleChar(str) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the string representation of math interval, specified by two points and include / exclude flags.
- * See the details: https://en.wikipedia.org/wiki/Interval_(mathematics)
- *
- * Please take attention, that the smaller number should be the first in the notation
- *
- * @param {number} a
- * @param {number} b
- * @param {bool} isStartIncluded
- * @param {bool} isEndIncluded
- * @return {string}
- *
- * @example
- *   0, 1, true, true   => '[0, 1]'
- *   0, 1, true, false  => '[0, 1)'
- *   0, 1, false, true  => '(0, 1]'
- *   0, 1, false, false => '(0, 1)'
- * Smaller number has to be first :
- *   5, 3, true, true   => '[3, 5]'
- *
- */
-function getIntervalString(a, b, isStartIncluded, isEndIncluded) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Reverse the specified string (put all chars in reverse order)
- *
- * @param {string} str
- * @return {string}
- *
- * @example:
- * 'The quick brown fox jumps over the lazy dog' => 'god yzal eht revo spmuj xof nworb kciuq ehT'
- * 'abracadabra' => 'arbadacarba'
- * 'rotator' => 'rotator'
- * 'noon' => 'noon'
- */
-function reverseString(str) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Reverse the specified integer number (put all digits in reverse order)
- *
- * @param {number} num
- * @return {number}
- *
- * @example:
- *   12345 => 54321
- *   1111  => 1111
- *   87354 => 45378
- *   34143 => 34143
- */
-function reverseInteger(num) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Validates the CCN (credit card number) and return true if CCN is valid
- * and false otherwise.
- *
- * See algorithm here : https://en.wikipedia.org/wiki/Luhn_algorithm
- *
- * @param {number} cnn
- * @return {boolean}
- *
- * @example:
- *   79927398713      => true
- *   4012888888881881 => true
- *   5123456789012346 => true
- *   378282246310005  => true
- *   371449635398431  => true
- *
- *   4571234567890111 => false
- *   5436468789016589 => false
- *   4916123456789012 => false
- */
-function isCreditCardNumber(ccn) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the digital root of integer:
- *   step1 : find sum of all digits
- *   step2 : if sum > 9 then goto step1 otherwise return the sum
- *
- * @param {number} n
- * @return {number}
- *
- * @example:
- *   12345 ( 1+2+3+4+5 = 15, 1+5 = 6) => 6
- *   23456 ( 2+3+4+5+6 = 20, 2+0 = 2) => 2
- *   10000 ( 1+0+0+0+0 = 1 ) => 1
- *   165536 (1+6+5+5+3+6 = 26,  2+6 = 8) => 8
- */
-function getDigitalRoot(num) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns true if the specified string has the balanced brackets and false otherwise.
- * Balanced means that is, whether it consists entirely of pairs of opening/closing brackets
- * (in that order), none of which mis-nest.
- * Brackets include [],(),{},<>
- *
- * @param {string} str
- * @return {boolean}
- *
- * @example:
- *   '' => true
- *   '[]'  => true
- *   '{}'  => true
- *   '()   => true
- *   '[[]' => false
- *   ']['  => false
- *   '[[][][[]]]' => true
- *   '[[][]][' => false
- *   '{)' = false
- *   '{[(<{[]}>)]}' = true 
- */
-function isBracketsBalanced(str) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the human readable string of time period specified by the start and end time.
- * The result string should be constrcuted using the folliwing rules:
- *
- * ---------------------------------------------------------------------
- *   Difference                 |  Result
- * ---------------------------------------------------------------------
- *    0 to 45 seconds           |  a few seconds ago
- *   45 to 90 seconds           |  a minute ago
- *   90 seconds to 45 minutes   |  2 minutes ago ... 45 minutes ago
- *   45 to 90 minutes           |  an hour ago
- *  90 minutes to 22 hours      |  2 hours ago ... 22 hours ago
- *  22 to 36 hours              |  a day ago
- *  36 hours to 25 days         |  2 days ago ... 25 days ago
- *  25 to 45 days               |  a month ago
- *  45 to 345 days              |  2 months ago ... 11 months ago
- *  345 to 545 days (1.5 years) |  a year ago
- *  546 days+                   |  2 years ago ... 20 years ago
- * ---------------------------------------------------------------------
- *
- * @param {Date} startDate
- * @param {Date} endDate
- * @return {string}
- *
- * @example
- *   Date('2000-01-01 01:00:00.100'), Date('2000-01-01 01:00:00.200')  => 'a few seconds ago'
- *   Date('2000-01-01 01:00:00.100'), Date('2000-01-01 01:00:05.000')  => '5 minutes ago'
- *   Date('2000-01-01 01:00:00.100'), Date('2000-01-02 03:00:05.000')  => 'a day ago'
- *   Date('2000-01-01 01:00:00.100'), Date('2015-01-02 03:00:05.000')  => '15 years ago'
- *
- */
-function timespanToHumanString(startDate, endDate) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the string with n-ary (binary, ternary, etc, where n<=10) representation of specified number.
- * See more about
- * https://en.wikipedia.org/wiki/Binary_number
- * https://en.wikipedia.org/wiki/Ternary_numeral_system
- * https://en.wikipedia.org/wiki/Radix
- *
- * @param {number} num
- * @param {number} n, radix of the result
- * @return {string}
- *
- * @example:
- *   1024, 2  => '10000000000'
- *   6561, 3  => '100000000'
- *    365, 2  => '101101101'
- *    365, 3  => '111112'
- *    365, 4  => '11231'
- *    365, 10 => '365'
- */
-function toNaryString(num, n) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the commom directory path for specified array of full filenames.
- *
- * @param {array} pathes
- * @return {string}
- *
- * @example:
- *   ['/web/images/image1.png', '/web/images/image2.png']  => '/web/images/'
- *   ['/web/assets/style.css', '/web/scripts/app.js',  'home/setting.conf'] => ''
- *   ['/web/assets/style.css', '/.bin/mocha',  '/read.me'] => '/'
- *   ['/web/favicon.ico', '/web-scripts/dump', '/webalizer/logs'] => '/'
- */
-function getCommonDirectoryPath(pathes) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the product of two specified matrixes.
- * See details: https://en.wikipedia.org/wiki/Matrix_multiplication
- *
- * @param {array} m1
- * @param {array} m2
- * @return {array}
- *
- * @example:
- *   [[ 1, 0, 0 ],       [[ 1, 2, 3 ],           [[ 1, 2, 3 ],
- *    [ 0, 1, 0 ],   X    [ 4, 5, 6 ],     =>     [ 4, 5, 6 ],
- *    [ 0, 0, 1 ]]        [ 7, 8, 9 ]]            [ 7, 8, 9 ]]
- *
- *                        [[ 4 ],
- *   [[ 1, 2, 3]]    X     [ 5 ],          =>     [[ 32 ]]
- *                         [ 6 ]]
- *
- */
-function getMatrixProduct(m1, m2) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the evaluation of the specified tic-tac-toe position.
- * See the details: https://en.wikipedia.org/wiki/Tic-tac-toe
- *
- * Position is provides as 3x3 array with the following values: 'X','0', undefined
- * Function should return who is winner in the current position according to the game rules.
- * The result can be: 'X','0',undefined
- *
- * @param {array} position
- * @return {string}
- *
- * @example
- *
- *   [[ 'X',   ,'0' ],
- *    [    ,'X','0' ],       =>  'X'
- *    [    ,   ,'X' ]]
- *
- *   [[ '0','0','0' ],
- *    [    ,'X',    ],       =>  '0'
- *    [ 'X',   ,'X' ]]
- *
- *   [[ '0','X','0' ],
- *    [    ,'X',    ],       =>  undefined
- *    [ 'X','0','X' ]]
- *
- *   [[    ,   ,    ],
- *    [    ,   ,    ],       =>  undefined
- *    [    ,   ,    ]]
- *
- */
-function evaluateTicTacToePosition(position) {
-    throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    getFizzBuzz: getFizzBuzz,
-    getFactorial: getFactorial,
-    getSumBetweenNumbers: getSumBetweenNumbers,
-    isTriangle: isTriangle,
-    doRectanglesOverlap: doRectanglesOverlap,
-    isInsideCircle: isInsideCircle,
-    findFirstSingleChar: findFirstSingleChar,
-    getIntervalString : getIntervalString,
-    reverseString: reverseString,
-    reverseInteger: reverseInteger,
-    isCreditCardNumber: isCreditCardNumber,
-    getDigitalRoot: getDigitalRoot,
-    isBracketsBalanced: isBracketsBalanced,
-    timespanToHumanString : timespanToHumanString,
-    toNaryString: toNaryString,
-    getCommonDirectoryPath: getCommonDirectoryPath,
-    getMatrixProduct: getMatrixProduct,
-    evaluateTicTacToePosition : evaluateTicTacToePosition
-};
diff --git a/task/07-yield-tasks.js b/task/07-yield-tasks.js
deleted file mode 100644
index 9e88bf9b7..000000000
--- a/task/07-yield-tasks.js
+++ /dev/null
@@ -1,159 +0,0 @@
-'use strict';
-
-/********************************************************************************************
- *                                                                                          *
- * Plese read the following tutorial before implementing tasks:                             *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators   *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield        *
- *                                                                                          *
- ********************************************************************************************/
-
-
-/**
- * Returns the lines sequence of "99 Bottles of Beer" song:
- *
- *  '99 bottles of beer on the wall, 99 bottles of beer.'
- *  'Take one down and pass it around, 98 bottles of beer on the wall.'
- *  '98 bottles of beer on the wall, 98 bottles of beer.'
- *  'Take one down and pass it around, 97 bottles of beer on the wall.'
- *  ...
- *  '1 bottle of beer on the wall, 1 bottle of beer.'
- *  'Take one down and pass it around, no more bottles of beer on the wall.'
- *  'No more bottles of beer on the wall, no more bottles of beer.'
- *  'Go to the store and buy some more, 99 bottles of beer on the wall.'
- *
- * See the full text at
- * http://99-bottles-of-beer.net/lyrics.html
- *
- * NOTE: Please try to complete this task faster then original song finished:
- * https://www.youtube.com/watch?v=Z7bmyjxJuVY   :)
- *
- *
- * @return {Iterable.<string>}
- *
- */
-function* get99BottlesOfBeer() {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the Fibonacci sequence:
- *   0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, ...
- *
- * See more at: https://en.wikipedia.org/wiki/Fibonacci_number
- *
- * @return {Iterable.<number>}
- *
- */
-function* getFibonacciSequence() {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Traverses a tree using the depth-first strategy
- * See details: https://en.wikipedia.org/wiki/Depth-first_search
- *
- * Each node have child nodes in node.children array.
- * The leaf nodes do not have 'children' property.
- *
- * @params {object} root the tree root
- * @return {Iterable.<object>} the sequence of all tree nodes in depth-first order
- * @example
- *
- *   var node1 = { n:1 }, node2 = { n:2 }, node3 = { n:3 }, node4 = { n:4 },
- *       node5 = { n:5 }, node6 = { n:6 }, node7 = { n:7 }, node8 = { n:8 };
- *   node1.children = [ node2, node6, node7 ];
- *   node2.children = [ node3, node4 ];
- *   node4.children = [ node5 ];
- *   node7.children = [ node8 ];
- *
- *     source tree (root = 1):
- *            1
- *          / | \
- *         2  6  7
- *        / \     \            =>    { 1, 2, 3, 4, 5, 6, 7, 8 }
- *       3   4     8
- *           |
- *           5
- *
- *  depthTraversalTree(node1) => node1, node2, node3, node4, node5, node6, node7, node8
- *
- */
-function* depthTraversalTree(root) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Traverses a tree using the breadth-first strategy
- * See details: https://en.wikipedia.org/wiki/Breadth-first_search
- *
- * Each node have child nodes in node.children array.
- * The leaf nodes do not have 'children' property.
- *
- * @params {object} root the tree root
- * @return {Iterable.<object>} the sequence of all tree nodes in breadth-first order
- * @example
- *     source tree (root = 1):
- *
- *            1
- *          / | \
- *         2  3  4
- *        / \     \            =>    { 1, 2, 3, 4, 5, 6, 7, 8 }
- *       5   6     7
- *           |
- *           8
- *
- */
-function* breadthTraversalTree(root) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Merges two yield-style sorted sequences into the one sorted sequence.
- * The result sequence consists of sorted items from source iterators.
- *
- * @params {Iterable.<number>} source1
- * @params {Iterable.<number>} source2
- * @return {Iterable.<number>} the merged sorted sequence
- *
- * @example
- *   [ 1, 3, 5, ... ], [2, 4, 6, ... ]  => [ 1, 2, 3, 4, 5, 6, ... ]
- *   [ 0 ], [ 2, 4, 6, ... ]  => [ 0, 2, 4, 6, ... ]
- *   [ 1, 3, 5, ... ], [ -1 ] => [ -1, 1, 3, 5, ...]
- */
-function* mergeSortedSequences(source1, source2) {
-    throw new Error('Not implemented');
-}
-
-/**
- * Resolve Promises and take values step by step.
- * 
- * @params {Iterable.<Promise>} generator
- * @return {Promise} Promise with value returned via return 
- *
- * @example
- *   async((function*() {
- *      var a = yield new Promise((resolve)=> setTimeout(()=>resolve(5)));
- *      var b = yield Promise.resolve(6);
- *      return a + b;
- *   }).then(value=>console.log(value))  => 11
- *
- *   Most popular implementation of the logic in npm https://www.npmjs.com/package/co
- */
-function async(generator) {
-    throw new Error('Not implemented');
-}
-
-
-module.exports = {
-    get99BottlesOfBeer: get99BottlesOfBeer,
-    getFibonacciSequence: getFibonacciSequence,
-    depthTraversalTree: depthTraversalTree,
-    breadthTraversalTree: breadthTraversalTree,
-    mergeSortedSequences: mergeSortedSequences,
-    async               : async
-};
diff --git a/task/08-objects-tasks.js b/task/08-objects-tasks.js
deleted file mode 100644
index 610b1e7b2..000000000
--- a/task/08-objects-tasks.js
+++ /dev/null
@@ -1,146 +0,0 @@
-'use strict';
-
-/**************************************************************************************************
- *                                                                                                *
- * Plese read the following tutorial before implementing tasks:                                   *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer *
- * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object        *
- *                                                                                                *
- **************************************************************************************************/
-
-
-/**
- * Returns the rectagle object with width and height parameters and getArea() method
- *
- * @param {number} width
- * @param {number} height
- * @return {Object}
- *
- * @example
- *    var r = new Rectangle(10,20);
- *    console.log(r.width);       // => 10
- *    console.log(r.height);      // => 20
- *    console.log(r.getArea());   // => 200
- */
-function Rectangle(width, height) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the JSON representation of specified object
- *
- * @param {object} obj
- * @return {string}
- *
- * @example
- *    [1,2,3]   =>  '[1,2,3]'
- *    { width: 10, height : 20 } => '{"height":10,"width":20}'
- */
-function getJSON(obj) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Returns the object of specified type from JSON representation
- *
- * @param {Object} proto
- * @param {string} json
- * @return {object}
- *
- * @example
- *    var r = fromJSON(Rectangle.prototype, '{"width":10, "height":20}');
- *
- */
-function fromJSON(proto, json) {
-    throw new Error('Not implemented');
-}
-
-
-/**
- * Css selectors builder
- *
- * Each complex selector can consists of type, id, class, attribute, pseudo-class and pseudo-element selectors:
- *
- *    element#id.class[attr]:pseudoClass::pseudoElement
- *              \----/\----/\----------/
- *              Can be several occurences
- *
- * All types of selectors can be combined using the combinators ' ','+','~','>' .
- *
- * The task is to design a single class, independent classes or classes hierarchy and implement the functionality
- * to build the css selectors using the provided cssSelectorBuilder.
- * Each selector should have the stringify() method to output the string repsentation according to css specification.
- *
- * Provided cssSelectorBuilder should be used as facade only to create your own classes,
- * for example the first method of cssSelectorBuilder can be like this:
- *   element: function(value) {
- *       return new MySuperBaseElementSelector(...)...
- *   },
- *
- * The design of class(es) is totally up to you, but try to make it as simple, clear and readable as possible.
- *
- * @example
- *
- *  var builder = cssSelectorBuilder;
- *
- *  builder.id('main').class('container').class('editable').stringify()  => '#main.container.editable'
- *
- *  builder.element('a').attr('href$=".png"').pseudoClass('focus').stringify()  => 'a[href$=".png"]:focus'
- *
- *  builder.combine(
- *      builder.element('div').id('main').class('container').class('draggable'),
- *      '+',
- *      builder.combine(
- *          builder.element('table').id('data'),
- *          '~',
- *           builder.combine(
- *               builder.element('tr').pseudoClass('nth-of-type(even)'),
- *               ' ',
- *               builder.element('td').pseudoClass('nth-of-type(even)')
- *           )
- *      )
- *  ).stringify()        =>    'div#main.container.draggable + table#data ~ tr:nth-of-type(even)   td:nth-of-type(even)'
- *
- *  For more examples see unit tests.
- */
-
-const cssSelectorBuilder = {
-
-    element: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    id: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    class: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    attr: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    pseudoClass: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    pseudoElement: function(value) {
-        throw new Error('Not implemented');
-    },
-
-    combine: function(selector1, combinator, selector2) {
-        throw new Error('Not implemented');
-    },
-};
-
-
-module.exports = {
-    Rectangle: Rectangle,
-    getJSON: getJSON,
-    fromJSON: fromJSON,
-    cssSelectorBuilder: cssSelectorBuilder
-};
diff --git a/task/09-functions-n-closures-tasks.js b/task/09-functions-n-closures-tasks.js
index 6ba9dcedd..236cbed41 100644
--- a/task/09-functions-n-closures-tasks.js
+++ b/task/09-functions-n-closures-tasks.js
@@ -26,7 +26,7 @@
  *
  */
 function getComposition(f,g) {
-    throw new Error('Not implemented');
+    return (x)=>f(g(x));
 }
 
 
@@ -47,7 +47,7 @@ function getComposition(f,g) {
  *
  */
 function getPowerFunction(exponent) {
-    throw new Error('Not implemented');
+    return (x)=> Math.pow(x,exponent);
 }
 
 
@@ -65,7 +65,14 @@ function getPowerFunction(exponent) {
  *   getPolynom()      => null
  */
 function getPolynom() {
-    throw new Error('Not implemented');
+    if(arguments.length==0) return null;
+    return (x)=>{
+        let result=0;
+        for(let i=0; i<arguments.length; i++){
+            result+=arguments[i]*Math.pow(x,arguments.length-i-1);
+        }
+        return result;
+    }
 }
 
 
@@ -84,7 +91,13 @@ function getPolynom() {
  *   memoizer() => the same random number  (next run, returns the previous cached result)
  */
 function memoize(func) {
-    throw new Error('Not implemented');
+   
+    let cache=undefined;
+    function closure(){
+        if (cache === undefined) return cache=func();
+        else return cache;
+    }
+    return closure;
 }
 
 
@@ -104,7 +117,16 @@ function memoize(func) {
  * retryer() => 2
  */
 function retry(func, attempts) {
-    throw new Error('Not implemented');
+     return function attempt(){
+        while(attempts>0){
+            try{
+                return func();
+            }catch(error){
+                attempts--;
+            }
+        }        
+         throw new Error("fulyError");
+    }
 }
 
 
@@ -132,7 +154,13 @@ function retry(func, attempts) {
  *
  */
 function logger(func, logFunc) {
-    throw new Error('Not implemented');
+    return function () {
+        const str = `${func.name}(${JSON.stringify([...arguments]).slice(1, -1)}) `;
+        logFunc(str + 'starts');
+        const result = func.apply(null, arguments);
+        logFunc(str + 'ends');
+        return result;
+    };
 }
 
 
@@ -150,7 +178,11 @@ function logger(func, logFunc) {
  *   partialUsingArguments(fn, 'a','b','c','d')() => 'abcd'
  */
 function partialUsingArguments(fn) {
-    throw new Error('Not implemented');
+    let result = Array.from([...arguments]).slice(1);
+    return function(){
+        result += [...arguments];
+        return result.replace(/[\s.,%]/g, '');
+    }
 }
 
 
@@ -171,11 +203,15 @@ function partialUsingArguments(fn) {
  *   getId10() => 11
  */
 function getIdGeneratorFunction(startFrom) {
-    throw new Error('Not implemented');
+    let count=arguments[0];
+    return ()=>{
+        count++;
+        return count-1;
+    }
 }
 
 
-module.exports = {
+module.exports = { 
     getComposition: getComposition,
     getPowerFunction: getPowerFunction,
     getPolynom: getPolynom,
diff --git a/task/package.json b/task/package.json
new file mode 100644
index 000000000..9ad27a858
--- /dev/null
+++ b/task/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "task",
+  "version": "1.0.0",
+  "description": "",
+  "main": "01-strings-tasks.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}