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Commit f5188dd

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dev-madhurendramadhuredra
and
madhuredra
authored
added an algo which finds unique element in an array (TheAlgorithms#1359)
* added an algo which finds unique element in an array * fixed code style * updated changes and add some explanations * Delete package-lock.json * Delete package.json * added question link if anyone want to solve * updated changes * added package.json * used JSDoc comment --------- Co-authored-by: madhuredra <madhuredra.tiwari@zemosolabs.com>
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/**
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* Finds the unique element in an array where all other elements are repeated twice.
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*
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* @param {number[]} arr - The input array of integers.
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* @returns {number} The unique element.
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*
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* @example
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* const arr = [1, 2, 1, 2, 3];
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* const uniqueElement = findUniqueElement(arr); // Returns 3
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*/
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const findUniqueElement = (arr) => arr.reduce((acc, val) => acc ^ val, 0)
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export { findUniqueElement }
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import { findUniqueElement } from '../UniqueElementInAnArray'
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describe('UniqueElementInAnArray', () => {
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it.each([
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[[1, 2, 1, 3, 3], 2],
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[[1, 2, 3, 4, 5, 4, 3, 2, 1], 5]
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])('should return an unique element from an array', (arr, expected) => {
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expect(findUniqueElement(arr)).toBe(expected)
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})
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})

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