Run results for: array slice vs immutable-js takeLast

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4315.4 Safari/537.36

Browser: Chrome 88

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
array slice	4509.6 Ops/sec
immutable-js	58.1 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/immutability-helper@2.7.0/index.min.js"></script>

Tests:

array slice
const data = new Array(300).fill(55); let initArr = new Array(10000).fill(88); const limitArr = (arr, limit) => (arr.length > limit ? arr.slice(-limit) : arr); for(i=0; i<100; i++) { initArr.push(...data); initArr = limitArr(initArr, 1000); }
immutable-js
const data = new Array(300).fill(55); let initList = Immutable.List(); initList = initList.push(...(new Array(10000).fill(88))); const limitList = (list, limit) => (list.size > limit ? list.takeLast(limit) : list); for(i=0; i<100; i++) { initList = limitList(initList.push(...data), 1000); }