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New Algorithm: Parity Outlier (#1314)
* [feat] New algorithm * [test] Add new test for ParityOutlier.js * [fix] Reset indentation * [fix] Reset indentation * [fix] Style changes * fix: improve code efficiency and a glitch * test: adds a new possible test case * fix: style fix * fix: delete redundant comments and else statements * [fix] style fix
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Maths/ParityOutlier.js
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33
Maths/ParityOutlier.js
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/**
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* @author mrmagic2020
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* @description The function will find the parity outlier from an array of integers.
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* @see https://en.wikipedia.org/wiki/Parity_(mathematics)
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* @param {number[]} integers - An array of integers.
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* @returns {number} - The parity outlier.
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* @example parityOutlier([1, 3, 5, 8, 9]) = 8
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*/
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const parityOutlier = (integers) => {
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let oddsCount = 0 // define counter for odd number(s)
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let evensCount = 0 // define counter for even number(s)
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let odd, even
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for (const e of integers) {
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if (!Number.isInteger(e)) { // detect non-integer elements
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return null
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}
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if (e % 2 === 0) { // an even number
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even = e
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evensCount++
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} else { // an odd number
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odd = e
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oddsCount++
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}
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}
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if (oddsCount === 0 || evensCount === 0) return null // array has only odd/even number(s)
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if (oddsCount > 1 && evensCount > 1) return null // array has more than one even and odd number
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return oddsCount === 1 ? odd : even
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}
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export { parityOutlier }
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Maths/test/ParityOutlier.test.js
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Maths/test/ParityOutlier.test.js
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import { parityOutlier } from '../ParityOutlier'
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describe('Testing parityOutlier function', () => {
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it('should return the odd number in an array of even numbers', () => {
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expect(parityOutlier([1, 2, 16, -8848, 5126])).toBe(1)
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})
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it('should return the even number in an array of odd numbers', () => {
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expect(parityOutlier([177, 5, 76, 1919])).toBe(76)
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})
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it('should, if the given array has only one integer element, return the integer itself', () => {
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expect(parityOutlier([83])).toBe(83)
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expect(parityOutlier([54])).toBe(54)
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})
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it('should, if the given array has only an odd and an even number, return the odd outlier', () => {
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expect(parityOutlier([1, 2])).toBe(1)
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expect(parityOutlier([4, 3])).toBe(3)
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})
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it('should return null if the given array is empty, contains only one integer, contains non-interger elements or does not have a parity outlier', () => {
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expect(parityOutlier([])).toBe(null)
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expect(parityOutlier([2])).toBe(null)
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expect(parityOutlier([2, {}, 5, 'GitHub'])).toBe(null)
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expect(parityOutlier([1, 3, 5, 7, 9])).toBe(null)
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expect(parityOutlier([0, 2, 4, 6, 8])).toBe(null)
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expect(parityOutlier([1, 3, 5, 7, 2, 4, 6, 8])).toBe(null)
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})
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})
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