Run results for: Remove Duplicated Character Test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

forEach

73.5M/s

for++

7.9M/s

View exact numbers

Test name	Executions per second
✓ forEach	73,542,776 Ops/sec
for++	7,889,086 Ops/sec

HTML Preparation code:

<div id='test'></div>

Script Preparation code:

const WORDS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+/"
let src = '';
let dst = '';
for (i = 0; i < 1024; i++) {
    src += WORDS[Math.floor(Math.random() * WORDS.length)];
}

Tests:

indexOf
[...src].forEach(ch=>{if(dst.indexOf(ch)===-1) dst += ch});
Set
[...(new Set([...src]))].forEach(ch=>dst+=ch);
object
let obj = {}; [...src].forEach(ch=>{if(!obj[ch]){obj[ch]=true;dst+=ch;}});
RegExp
dst = src.replace(/(.)(?=.*\1)/g,"")

Run results for: Remove Duplicated Character Test

Remove Duplicated Character Test

indexOf

Set

object

RegExp