add reverse-string (#568)

config.json

@@ -961,6 +961,14 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 1
+      },
+      {
+        "slug": "reverse-string",
+        "name": "Reverse String",
+        "uuid": "9400fc2a-b3e8-4982-883b-a2d574a1d7ee",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
       }
     ],
     "foregone": [

exercises/practice/reverse-string/.docs/instructions.md

@@ -0,0 +1,9 @@
+# Instructions
+
+Your task is to reverse a given string.
+
+Some examples:
+
+- Turn `"stressed"` into `"desserts"`.
+- Turn `"strops"` into `"sports"`.
+- Turn `"racecar"` into `"racecar"`.

exercises/practice/reverse-string/.docs/introduction.md

@@ -0,0 +1,5 @@
+# Introduction
+
+Reversing strings (reading them from right to left, rather than from left to right) is a surprisingly common task in programming.
+
+For example, in bioinformatics, reversing the sequence of DNA or RNA strings is often important for various analyses, such as finding complementary strands or identifying palindromic sequences that have biological significance.

exercises/practice/reverse-string/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "src/reverse_string.erl"
+    ],
+    "test": [
+      "test/reverse_string_tests.erl"
+    ],
+    "example": [
+      ".meta/example.erl"
+    ]
+  },
+  "blurb": "Reverse a given string.",
+  "source": "Introductory challenge to reverse an input string",
+  "source_url": "https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb"
+}

exercises/practice/reverse-string/.meta/example.erl

@@ -0,0 +1,6 @@
+-module(example).
+
+-export([reverse/1]).
+
+reverse(_String) ->
+    lists:reverse(_String).

exercises/practice/reverse-string/.meta/tests.toml

@@ -0,0 +1,39 @@
+# 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.
+
+[c3b7d806-dced-49ee-8543-933fd1719b1c]
+description = "an empty string"
+
+[01ebf55b-bebb-414e-9dec-06f7bb0bee3c]
+description = "a word"
+
+[0f7c07e4-efd1-4aaa-a07a-90b49ce0b746]
+description = "a capitalized word"
+
+[71854b9c-f200-4469-9f5c-1e8e5eff5614]
+description = "a sentence with punctuation"
+
+[1f8ed2f3-56f3-459b-8f3e-6d8d654a1f6c]
+description = "a palindrome"
+
+[b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c]
+description = "an even-sized word"
+
+[1bed0f8a-13b0-4bd3-9d59-3d0593326fa2]
+description = "wide characters"
+
+[93d7e1b8-f60f-4f3c-9559-4056e10d2ead]
+description = "grapheme cluster with pre-combined form"
+include = false
+
+[1028b2c1-6763-4459-8540-2da47ca512d9]
+description = "grapheme clusters"
+include = false

exercises/practice/reverse-string/rebar.config

@@ -0,0 +1,30 @@
+%% Erlang compiler options
+{erl_opts, [debug_info, warnings_as_errors]}.
+
+{deps, [{erl_exercism, "0.1.2"}]}.
+
+{dialyzer, [
+  {warnings, [underspecs, no_return]},
+  {get_warnings, true},
+  {plt_apps, top_level_deps}, % top_level_deps | all_deps
+  {plt_extra_apps, []},
+  {plt_location, local}, % local | "/my/file/name"
+  {plt_prefix, "rebar3"},
+  {base_plt_apps, [stdlib, kernel, crypto]},
+  {base_plt_location, global}, % global | "/my/file/name"
+  {base_plt_prefix, "rebar3"}
+]}.
+
+%% eunit:test(Tests)
+{eunit_tests, []}.
+%% Options for eunit:test(Tests, Opts)
+{eunit_opts, [verbose]}.
+
+%% == xref ==
+
+{xref_warnings, true}.
+
+%% xref checks to run
+{xref_checks, [undefined_function_calls, undefined_functions,
+  locals_not_used, exports_not_used,
+  deprecated_function_calls, deprecated_functions]}.

exercises/practice/reverse-string/src/reverse_string.app.src

@@ -0,0 +1,9 @@
+{application, reverse_string,
+  [{description, "exercism.io - reverse string"},
+    {vsn, "0.0.1"},
+    {modules, []},
+    {registered, []},
+    {applications, [kernel,
+      stdlib]},
+    {env, []}
+  ]}.

exercises/practice/reverse-string/src/reverse_string.erl

@@ -0,0 +1,6 @@
+-module(reverse_string).
+
+-export([reverse/1]).
+
+reverse(_String) ->
+    undefined.

exercises/practice/reverse-string/test/reverse_string_tests.erl

@@ -0,0 +1,56 @@
+-module(reverse_string_tests).
+
+-include_lib("erl_exercism/include/exercism.hrl").
+-include_lib("eunit/include/eunit.hrl").
+
+
+
+
+'1_reverse_an_empty_string_test_'() ->
+    Input = "",
+    Expected = "",
+    {"reverse an empty string",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'2_reverse_a_word_test_'() ->
+    Input = "robot",
+    Expected = "tobor",
+    {"reverse a word",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'3_reverse_a_capitalized_word_test_'() ->
+    Input = "Ramen",
+    Expected = "nemaR",
+    {"reverse a capitalized word",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'4_reverse_a_sentence_with_punctuation_test_'() ->
+    Input = "I'm hungry!",
+    Expected = "!yrgnuh m'I",
+    {"reverse a sentence with punctuation",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'5_reverse_a_palindrome_test_'() ->
+    Input = "racecar",
+    Expected = "racecar",
+    {"reverse a palindrome",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'6_reverse_an_even_sized_word_test_'() ->
+    Input = "drawer",
+    Expected = "reward",
+    {"reverse an even-sized word",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.
+
+'7_reverse_wide_characters_test_'() ->
+    Input = "子猫",
+    Expected = "猫子",
+    {"reverse wide characters",
+     ?_assertEqual(Expected,
+                   reverse_string:reverse(Input))}.