Add sublist exercise (#387)

config.json

@@ -904,6 +904,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 6
+      },
+      {
+        "slug": "sublist",
+        "name": "Sublist",
+        "uuid": "6d296795-4b8a-4ec7-8cd6-808da63cede7",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
       }
     ]
   },

exercises/practice/sublist/.docs/instructions.append.md

@@ -0,0 +1,4 @@
+# Instructions append
+
+Whilst the instructions refer to working with lists, in R the vector type is a more common collection type.
+Hence, you should read "vector" whenever "list" is mentioned.

exercises/practice/sublist/.docs/instructions.md

@@ -0,0 +1,25 @@
+# Instructions
+
+Given any two lists `A` and `B`, determine if:
+
+- List `A` is equal to list `B`; or
+- List `A` contains list `B` (`A` is a superlist of `B`); or
+- List `A` is contained by list `B` (`A` is a sublist of `B`); or
+- None of the above is true, thus lists `A` and `B` are unequal
+
+Specifically, list `A` is equal to list `B` if both lists have the same values in the same order.
+List `A` is a superlist of `B` if `A` contains a contiguous sub-sequence of values equal to `B`.
+List `A` is a sublist of `B` if `B` contains a contiguous sub-sequence of values equal to `A`.
+
+Examples:
+
+- If `A = []` and `B = []` (both lists are empty), then `A` and `B` are equal
+- If `A = [1, 2, 3]` and `B = []`, then `A` is a superlist of `B`
+- If `A = []` and `B = [1, 2, 3]`, then `A` is a sublist of `B`
+- If `A = [1, 2, 3]` and `B = [1, 2, 3, 4, 5]`, then `A` is a sublist of `B`
+- If `A = [3, 4, 5]` and `B = [1, 2, 3, 4, 5]`, then `A` is a sublist of `B`
+- If `A = [3, 4]` and `B = [1, 2, 3, 4, 5]`, then `A` is a sublist of `B`
+- If `A = [1, 2, 3]` and `B = [1, 2, 3]`, then `A` and `B` are equal
+- If `A = [1, 2, 3, 4, 5]` and `B = [2, 3, 4]`, then `A` is a superlist of `B`
+- If `A = [1, 2, 4]` and `B = [1, 2, 3, 4, 5]`, then `A` and `B` are unequal
+- If `A = [1, 2, 3]` and `B = [1, 3, 2]`, then `A` and `B` are unequal

exercises/practice/sublist/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "sublist.R"
+    ],
+    "test": [
+      "test_sublist.R"
+    ],
+    "example": [
+      ".meta/example.R"
+    ]
+  },
+  "blurb": "Write a function to determine if a list is a sublist of another list."
+}

exercises/practice/sublist/.meta/example.R

@@ -0,0 +1,17 @@
+compare <- function(vec_one, vec_two) {
+  switch(sign(length(vec_one) - length(vec_two)) + 2,
+    ifelse(is_subvector(vec_one, vec_two), "subvector", "unequal"),
+    ifelse(identical(vec_one, vec_two), "equal", "unequal"),
+    ifelse(is_subvector(vec_two, vec_one), "supervector", "unequal")
+  )
+}
+
+is_subvector <- function(vec_one, vec_two) {
+  for (i in seq_len(length(vec_two) - length(vec_one) + 1)) {
+    if (all(vec_one == vec_two[i:(i + length(vec_one) - 1)])) {
+      return(TRUE)
+    }
+  }
+
+  FALSE
+}

exercises/practice/sublist/.meta/tests.toml

@@ -0,0 +1,64 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[97319c93-ebc5-47ab-a022-02a1980e1d29]
+description = "empty lists"
+
+[de27dbd4-df52-46fe-a336-30be58457382]
+description = "empty list within non empty list"
+
+[5487cfd1-bc7d-429f-ac6f-1177b857d4fb]
+description = "non empty list contains empty list"
+
+[1f390b47-f6b2-4a93-bc23-858ba5dda9a6]
+description = "list equals itself"
+
+[7ed2bfb2-922b-4363-ae75-f3a05e8274f5]
+description = "different lists"
+
+[3b8a2568-6144-4f06-b0a1-9d266b365341]
+description = "false start"
+
+[dc39ed58-6311-4814-be30-05a64bc8d9b1]
+description = "consecutive"
+
+[d1270dab-a1ce-41aa-b29d-b3257241ac26]
+description = "sublist at start"
+
+[81f3d3f7-4f25-4ada-bcdc-897c403de1b6]
+description = "sublist in middle"
+
+[43bcae1e-a9cf-470e-923e-0946e04d8fdd]
+description = "sublist at end"
+
+[76cf99ed-0ff0-4b00-94af-4dfb43fe5caa]
+description = "at start of superlist"
+
+[b83989ec-8bdf-4655-95aa-9f38f3e357fd]
+description = "in middle of superlist"
+
+[26f9f7c3-6cf6-4610-984a-662f71f8689b]
+description = "at end of superlist"
+
+[0a6db763-3588-416a-8f47-76b1cedde31e]
+description = "first list missing element from second list"
+
+[83ffe6d8-a445-4a3c-8795-1e51a95e65c3]
+description = "second list missing element from first list"
+
+[7bc76cb8-5003-49ca-bc47-cdfbe6c2bb89]
+description = "first list missing additional digits from second list"
+
+[0d7ee7c1-0347-45c8-9ef5-b88db152b30b]
+description = "order matters to a list"
+
+[5f47ce86-944e-40f9-9f31-6368aad70aa6]
+description = "same digits but different numbers"

exercises/practice/sublist/sublist.R

@@ -0,0 +1,3 @@
+compare <- function(vec_one, vec_two) {
+
+}

exercises/practice/sublist/test_sublist.R

@@ -0,0 +1,110 @@
+source("./sublist.R")
+library(testthat)
+
+test_that("Empty vectors", {
+  vector_one <- c()
+  vector_two <- c()
+  expect_equal(compare(vector_one, vector_two), "equal")
+})
+
+test_that("Empty vector within non empty vector", {
+  vector_one <- c()
+  vector_two <- c(1, 2, 3)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("Non empty vector contains empty vector", {
+  vector_one <- c(1, 2, 3)
+  vector_two <- c()
+  expect_equal(compare(vector_one, vector_two), "supervector")
+})
+
+test_that("vector equals itself", {
+  vector_one <- c(1, 2, 3)
+  vector_two <- c(1, 2, 3)
+  expect_equal(compare(vector_one, vector_two), "equal")
+})
+
+test_that("Different vectors", {
+  vector_one <- c(1, 2, 3)
+  vector_two <- c(2, 3, 4)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})
+
+test_that("False start", {
+  vector_one <- c(1, 2, 5)
+  vector_two <- c(0, 1, 2, 3, 1, 2, 5, 6)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("Consecutive", {
+  vector_one <- c(1, 1, 2)
+  vector_two <- c(0, 1, 1, 1, 2, 1, 2)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("Subvector at start", {
+  vector_one <- c(0, 1, 2)
+  vector_two <- c(0, 1, 2, 3, 4, 5)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("Subvector in middle", {
+  vector_one <- c(2, 3, 4)
+  vector_two <- c(0, 1, 2, 3, 4, 5)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("Subvector at end", {
+  vector_one <- c(3, 4, 5)
+  vector_two <- c(0, 1, 2, 3, 4, 5)
+  expect_equal(compare(vector_one, vector_two), "subvector")
+})
+
+test_that("At start of supervector", {
+  vector_one <- c(0, 1, 2, 3, 4, 5)
+  vector_two <- c(0, 1, 2)
+  expect_equal(compare(vector_one, vector_two), "supervector")
+})
+
+test_that("In middle of supervector", {
+  vector_one <- c(0, 1, 2, 3, 4, 5)
+  vector_two <- c(2, 3)
+  expect_equal(compare(vector_one, vector_two), "supervector")
+})
+
+test_that("At end of supervector", {
+  vector_one <- c(0, 1, 2, 3, 4, 5)
+  vector_two <- c(3, 4, 5)
+  expect_equal(compare(vector_one, vector_two), "supervector")
+})
+
+test_that("First vector missing element from second vector", {
+  vector_one <- c(1, 3)
+  vector_two <- c(1, 2, 3)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})
+
+test_that("Second vector missing element from first vector", {
+  vector_one <- c(1, 2, 3)
+  vector_two <- c(1, 3)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})
+
+test_that("First vector missing additional digits from second vector", {
+  vector_one <- c(1, 2)
+  vector_two <- c(1, 22)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})
+
+test_that("Order matters to a vector", {
+  vector_one <- c(1, 2, 3)
+  vector_two <- c(3, 2, 1)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})
+
+test_that("Same digits but different numbers", {
+  vector_one <- c(1, 0, 1)
+  vector_two <- c(10, 1)
+  expect_equal(compare(vector_one, vector_two), "unequal")
+})