Run results for: indexOf vs map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser: Firefox 146

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Benchmark engine: Benchmark.js

map

25.6M/s

indexOf

121K/s

View exact numbers

Test name	Executions per second
✓ map	25,637,662 Ops/sec
indexOf	121,239 Ops/sec

Script Preparation code:

var array = [];
for (var i=0; i<100; ++i) {
  	array.push('00' + i);
}

function hasWithIndexOf(needle) {
	return array.indexOf(needle) !== -1;
}

var map = {};
array.forEach(item => map[item] = true);

function hasWithMap(needle) {
	return needle in map;
}

Tests:

indexOf
for (var i=0; i<100; ++i) { hasWithIndexOf('404'); }
map
for (var i=0; i<100; ++i) { hasWithMap('404'); }