Run results for: String.indexOf vs Map.get vs Object lookup

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

Map.get

171.5M/s

indexOf

148.9M/s

Object Accessor

71.3M/s

View exact numbers

Test name	Executions per second
✓ Map.get	171,490,544 Ops/sec
indexOf	148,931,104 Ops/sec
Object Accessor	71,263,432 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var ALPHA = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var DIGITS = '0123456789';
var ALL_CHARS = `${DIGITS}${ALPHA}`;
var CHARACTERS = ALL_CHARS.split('');
var CHARMAP = CHARACTERS.reduce((ret, char, idx) => ret.set(char, idx), new Map());
var CHAROBJ = CHARACTERS.reduce((ret, char, idx) => {ret[char] = idx; return ret;}, {});

var LETTER = 'N';
console.log('Prep:', {ALPHA,DIGITS,ALL_CHARS,CHARMAP,CHAROBJ,LETTER});

Tests:

indexOf
var i = ALL_CHARS.indexOf(LETTER);
Map.get
var i = CHARMAP.get(LETTER);
Object Accessor
var i = CHAROBJ[LETTER];