Run results for: Duplicate Object[] Test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Mac OS X 10.15.2

Device Platform: Desktop

Date tested: 4 years ago

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js'></script>

Script Preparation code:

var array = [
  { 'name': '소나타', 'brand': '현대' },
  { 'name': '아반떼', 'brand': '현대' },
  { 'name': 'K7', 'brand': '기아' }
];

Tests:

Object.values / Object.assign
function func(array) { const result = Object.values(array.reduce((prev, cur) => Object.assign(prev, { [cur.brand]: cur }), {})); return result; } func(array);
filter
function func(array) { let uniq = {}; const result = array.filter(arr => !uniq[arr.brand] && (uniq[arr.brand] = true)); return result; } func(array);
filter / findIndex
function func(array) { const result = array.filter((arr, i) => array.findIndex((arr2) => arr['brand'] === arr2['brand']) === i); return result; } func(array);
for / includes
function func(array) { let tempArray = [], resultArray = []; for (let i = 0; i < array.length; i++) { let arr = array[i]; if (tempArray.includes(arr['brand'])) { continue; } else { resultArray.push(arr); tempArray.push(arr['brand']); } } return resultArray; } func(array);
underscore
function func(array) { const result = _.uniq(array, 'brand'); return result; } func(array);
reduce / some
function func(array) { const result = array.reduce((prev, cur) => { if (!prev.some(obj => obj['brand'] !== cur['brand'])) { prev.push(cur); } return prev; }, []); return result; } func(array);