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Run results for:
loops-forin-forof-native-4
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
Browser:
Chrome 136
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
for-in
4.4 Ops/sec
for-of
287.0 Ops/sec
native
94.5 Ops/sec
native - cache lengh
183.5 Ops/sec
Script Preparation code:
var arr = []; const randomizeArray = () => { for (let i = 0; i < 50000; i++) { arr[i] = Math.floor(Math.random() * 100000); } } randomizeArray();
Tests:
for-in
let dummy = 0; for (let j = 0; j < 100; j++){ for (let i in arr) { dummy += i; } }
for-of
let dummy = 0; for (let j = 0; j < 100; j++){ for (let i of arr) { dummy += i; } }
native
let dummy = 0; for (let j = 0; j < 100; j++){ for (let i = 0; i < arr.length; i++) { dummy += arr[i]; } }
native - cache lengh
let dummy = 0; for (let j = 0; j < 100; j++){ let length = arr.length; for (let i = 0; i < length; i++) { dummy += arr[i]; } }