diff --git a/Data-Structures/Array/Reverse.js b/Data-Structures/Array/Reverse.js new file mode 100644 index 0000000000..79a789c017 --- /dev/null +++ b/Data-Structures/Array/Reverse.js @@ -0,0 +1,17 @@ +/** https://www.geeksforgeeks.org/write-a-program-to-Reverse-an-array-or-string/ + * This function will accept an array and + * Reverse its elements and returns the inverted array + * @param {Array} arr array with elements of any data type + * @returns {Array} array with inverted elements + */ + +const Reverse = (arr) => { + // limit specifies the amount of Reverse actions + for (let i = 0, j = arr.length - 1; i < arr.length / 2; i++, j--) { + const temp = arr[i] + arr[i] = arr[j] + arr[j] = temp + } + return arr +} +export { Reverse } diff --git a/Data-Structures/Array/test/Reverse.test.js b/Data-Structures/Array/test/Reverse.test.js new file mode 100644 index 0000000000..bf137fe655 --- /dev/null +++ b/Data-Structures/Array/test/Reverse.test.js @@ -0,0 +1,13 @@ +import { Reverse } from '../Reverse.js' +import each from 'jest-each' + +describe('reverse elements in an array', () => { + each` + array | expected + ${[]} | ${[]} + ${[1]} | ${[1]} + ${[1, 2, 3, 4]} | ${[4, 3, 2, 1]} + `.test('returns $expected when given $array', ({ array, expected }) => { + expect(Reverse(array)).toEqual(expected) + }) +})
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