🦄

Author: whizkydee

.babelrc

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+{
+  "presets": ["env"],
+  "plugins": [
+    "transform-minify-booleans",
+    "minify-dead-code-elimination",
+    "minify-flip-comparisons",
+    "minify-guarded-expressions",
+    "transform-merge-sibling-variables",
+    "minify-simplify"
+  ],
+  "comments": true
+}

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = crlf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+# 4 space indentation
+[**.{json, htaccess}]
+indent_style = space
+indent_size = 4

.eslintrc

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+{
+ "root": true,
+ "env": {
+   "commonjs": true,
+   "jest": true,
+   "node": true,
+   "es6": true
+ },
+ "parser": "babel-eslint",
+ "parserOptions": {
+   "sourceType": "module"
+ },
+ "extends": "eslint:recommended",
+ "rules": {
+   "no-case-declarations": "off",
+   "no-console": ["warn"]
+ }
+}

.gitignore

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+# Global
+*.map
+
+logs
+*.log
+npm-debug.log*
+node_modules/
+build/

.npmignore

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+.vscode
+src
+.eslintrc
+.babelrc
+.travis.yml
+.editorconfig
+.npmrc
+.gitignore
+__tests__

.npmrc

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+package-lock=false

.travis.yml

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+language: node_js
+node_js:
+  - '8'
+  - '6'

__tests__/arrays.js

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+import reverse from '../build/index'
+
+describe('array reverse', () => {
+
+  test('reverse an array of strings', () => {
+    const arr = ['I', 'would', 'love', 'to', 'have', 'some fun']
+    const reversedArr = reverse(arr)
+
+    expect(reversedArr).not.toEqual(arr)
+    // expect the original array to still retain its items
+    expect(reverse(reversedArr)).toEqual(arr)
+  })
+
+  test('reverse an array of numbers', () => {
+    const arr = [1, 2, 3, 4, 5, 1000]
+    const reversedArr = reverse(arr)
+
+    expect(reversedArr).toEqual([1000, 5, 4, 3, 2, 1])
+    // expect the original array to still retain its items
+    expect(reverse(reversedArr)).toEqual(arr)
+  })
+
+  test('reverse an array with several types of elements', () => {
+    const arr = [1, 2, 'one', 'two', true, false]
+    const reversedArr = reverse(arr)
+
+    expect(reversedArr).toEqual([false, true, 'two', 'one', 2, 1])
+    // expect the original array to still retain its items
+    expect(reverse(reversedArr)).toEqual(arr)
+  })
+
+})

__tests__/booleans.js

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+import reverse from '../build/index'
+
+describe('boolean reverse', () => {
+  test('should reverse `false` and return `true`', () => {
+    const boolean = false
+    const boolean2 = !1
+    expect(reverse(boolean)).toBeTruthy()
+    expect(reverse(boolean2)).toBeTruthy()
+  })
+
+  test('should reverse `true` and return `false`', () => {
+    const boolean = true
+    const boolean2 = !0
+    expect(reverse(boolean)).toBeFalsy()
+    expect(reverse(boolean2)).toBeFalsy()
+  })
+})

__tests__/numbers.js

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+import reverse from '../build/index'
+
+describe('number reverse', () => {
+  test('reverse a number without specifying options', () => {
+    const number = 12345
+    expect(reverse(number)).toEqual(54321)
+    expect(reverse(number)).not.toBeUndefined()
+  })
+
+  test('reverse a negative number without specifying options', () => {
+    const number = -12345
+    expect(reverse(number)).toEqual(-54321)
+    expect(reverse(number)).not.toBeUndefined()
+  })
+
+  test('change the indexes of a positive number', () => {
+    const number = 54321
+    expect(reverse(number, {invert: 'index'}))
+      .toEqual(12345)
+  })
+
+  test('change the indexes of a negative number', () => {
+    const number = -54321
+    expect(reverse(number, {invert: 'index'}))
+      .toEqual(-12345)
+  })
+
+  test('turn a positive number to negative', () => {
+    const number = 1234
+    expect(reverse(number, {invert: 'sign'}))
+      .toEqual(-1234)
+  })
+
+  test('turn a negative number to positive', () => {
+    const number = -1234
+    const reversed = reverse(number, {invert: 'sign'})
+    expect(reversed).toEqual(1234)
+  })
+})