4.js

console.log("** List of Inventors **");

const inventors = [
    { first: "Albert", last: "Einstein", year: 1879, passed: 1955 },
    { first: "Isaac", last: "Newton", year: 1643, passed: 1727 },
    { first: "Galileo", last: "Galilei", year: 1564, passed: 1642 },
    { first: "Marie", last: "Curie", year: 1867, passed: 1934 },
    { first: "Johannes", last: "Kepler", year: 1571, passed: 1630 },
    { first: "Nicolaus", last: "Copernicus", year: 1473, passed: 1543 },
    { first: "Max", last: "Planck", year: 1858, passed: 1947 },
    { first: "Katherine", last: "Blodgett", year: 1898, passed: 1979 },
    { first: "Ada", last: "Lovelace", year: 1815, passed: 1852 },
    { first: "Sarah E.", last: "Goode", year: 1855, passed: 1905 },
    { first: "Lise", last: "Meitner", year: 1878, passed: 1968 },
    { first: "Hanna", last: "Hammarström", year: 1829, passed: 1909 },
];

console.table(inventors);

console.log("** List of Random People **");

const people = [
    "Beck, Glenn",
    "Becker, Carl",
    "Beckett, Samuel",
    "Beddoes, Mick",
    "Beecher, Henry",
    "Beethoven, Ludwig",
    "Begin, Menachem",
    "Belloc, Hilaire",
    "Bellow, Saul",
    "Benchley, Robert",
    "Benenson, Peter",
    "Ben-Gurion, David",
    "Benjamin, Walter",
    "Benn, Tony",
    "Bennington, Chester",
    "Benson, Leana",
    "Bent, Silas",
    "Bentsen, Lloyd",
    "Berger, Ric",
    "Bergman, Ingmar",
    "Berio, Luciano",
    "Berle, Milton",
    "Berlin, Irving",
    "Berne, Eric",
    "Bernhard, Sandra",
    "Berra, Yogi",
    "Berry, Halle",
    "Berry, Wendell",
    "Bethea, Erin",
    "Bevan, Aneurin",
    "Bevel, Ken",
    "Biden, Joseph",
    "Bierce, Ambrose",
    "Biko, Steve",
    "Billings, Josh",
    "Biondo, Frank",
    "Birrell, Augustine",
    "Black, Elk",
    "Blair, Robert",
    "Blair, Tony",
    "Blake, William",
];

console.table(people);

// Filter()
console.log(
    "** Array.prototype.filter() ** \n 1. Filter the list of inventors for those who were born in the 1500's"
);

// Method 1
var peopleBefore1500 = inventors.filter(function (inventor) {
    if (inventor.year >= 1500 && inventor.year < 1600) {
        return true;
    } else {
        return false;
    }
});

// Method 2
peopleBefore1500 = inventors.filter(
    (inventor) => inventor.year >= 1500 && inventor.year < 1600
);

console.table(peopleBefore1500);

// Map()
console.log(
    "** Array.prototype.map() \n 2. Give us an array of the inventors first and last names"
);

// Method 1
var fullName = inventors.map(
    (inventor) => inventor.first + " " + inventor.last
);

// Method 2
fullName = inventors.map((inventor) => `${inventor.first} ${inventor.last}`);

console.table(fullName);

// Sort()
console.log(
    "** Array.prototype.sort() \n 3. Sort the inventors by birthdate, oldest to youngest"
);

// Method 1
var ordered = inventors.sort(function (aPerson, bPerson) {
    if (aPerson.year > bPerson.year) {
        return 1;
    } else {
        return -1;
    }
});

// Method 2
ordered = inventors.sort((aPerson, bPerson) =>
    aPerson.year > bPerson.year ? 1 : -1
);

console.table(ordered);

// Reduce()
console.log(
    "** Array.prototype.reduce() \n 4. How many years did all the inventors live all together?"
);

// Method 1
var age = inventors.reduce((total, inventor) => {
    inventor.age = inventor.passed - inventor.year;
    return total + inventor.age;
}, 0);

console.log(age);

console.log("5. Sort the inventors by years lived");

var ageSort = inventors.sort(function (aPerson, bPerson) {
    aPersonAge = aPerson.passed - aPerson.year;
    bPersonAge = bPerson.passed - bPerson.year;

    return aPersonAge < bPersonAge ? 1 : -1;
});

console.table(inventors);

// Map()->Filter()
console.log(
    "6. create a list of Boulevards in Paris that contain 'de' anywhere in the name \n Open 'https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris' in new tab and open Console in Developer Mode and run following commands sequentially."
);

console.log(
    '> const category = document.querySelector(".mw-category"); \n> const links = category.querySelectorAll("a"); \n> var arrLinks = Array.from(links); \n> const deIncludes = arrLinks.map(link => link.textContent).filter(name => name.includes("de")); \n> console.table(deIncludes);'
);

// Sort()

console.log("7. Sort Exercise \n Sort the people alphabetically by last name");

const sortedBylastName = people.sort((aPerson, bPerson) => {
    const [alast, afirst] = aPerson.split(",");
    const [blast, bfirst] = bPerson.split(",");
    return alast > blast ? 1 : -1;
});

console.table(sortedBylastName);

// Reduce()
console.log("** Reduce Exercise **");

const data = [
    "car",
    "car",
    "truck",
    "truck",
    "bike",
    "walk",
    "car",
    "van",
    "bike",
    "walk",
    "car",
    "van",
    "car",
    "truck",
];

console.table(data);

console.log("8. Sum up the instances of each of these given above");

const transportation = data.reduce(function (countObj, vehicle) {
    if (!countObj[vehicle]) {
        countObj[vehicle] = 0;
    }
    countObj[vehicle]++;
    return countObj;
}, {});

console.table(transportation);