find-array-duplicates

<!doctype html> <html lang="en"> <head> <title>Code coverage report for index.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <link rel="shortcut icon" type="image/x-icon" href="favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="index.html">All files</a> index.js</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">85.71% </span> <span class="quiet">Statements</span> <span class='fraction'>18/21</span> </div> <div class='fl pad1y space-right2'> <span class="strong">50% </span> <span class="quiet">Branches</span> <span class='fraction'>3/6</span> </div> <div class='fl pad1y space-right2'> <span class="strong">100% </span> <span class="quiet">Functions</span> <span 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utility functions to modify the return * @example * * const names = [ * { 'age': 36, 'name': 'Bob' }, * { 'age': 40, 'name': 'Harry' }, * { 'age': 1, 'name': 'Bob' } * ] * * duplicates(names, 'name').single() * // => [{ 'age': 36, 'name': 'Bob' }] (Returns the first object of the filtered duplicates) */   function duplicates(arr, property) { <span class="missing-if-branch" title="if path not taken" >I</span>if (!Array.isArray(arr)) <span class="cstat-no" title="statement not covered" > throw new Error(</span> `Please provide a valid Array, this could either be because you used an invalid array, or you provided a value which is not of type Array` ); <span class="missing-if-branch" title="if path not taken" >I</span>if (!property) <span class="cstat-no" title="statement not covered" >throw new Error(`The property parameter cannot be empty`);</span> const clone = [...arr]; <span class="missing-if-branch" title="if path not taken" >I</span>if (!clone[0].hasOwnProperty(property)) <span class="cstat-no" title="statement not covered" >throw new Error(`Could not find property [${property}] in Object Array`);</span>   const duplicates = [ ...new Set(clone.map((val) => val[property]).filter((item, index, iteratee) => iteratee.indexOf(item) !== index)) ];   const flattenedDupes = duplicates.map((val) => clone.filter((item) => item[property] === val)).flat();   return { single: () => flattenedDupes[0], all: () => flattenedDupes, modify: (cb) => cb(flattenedDupes), map: (cb) => flattenedDupes.map(cb), filter: (cb) => flattenedDupes.filter(cb), find: (cb) => flattenedDupes.find(cb) }; }   module.exports = duplicates  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Wed May 20 2020 11:32:59 GMT+0200 (South Africa Standard Time) </div> </div> <script src="prettify.js"></script> <script> window.onload = function () { 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