Run results for: map vs array

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:136.0) Gecko/136.0 Firefox/136.0

Browser: Firefox Mobile 136

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

map

1.5M/s

array

18K/s

View exact numbers

Test name	Executions per second
✓ map	1,546,684 Ops/sec
array	17,812 Ops/sec

Script Preparation code:

var array = [];
for (var i=0; i<300; ++i) {
  	array.push('00' + i);
}

function hasWithIndexOf(needle) {
	return array.indexOf(needle) !== -1;
}

var map = new Set();
array.forEach(item => map.add(item));

function hasWithMap(needle) {
	return map.has(needle);
}

Tests:

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