Run results for: indexOf vs map vs Set vs native Map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
indexOf	4055.9 Ops/sec
map	138118.0 Ops/sec
set	129948.8 Ops/sec
map2	139194.3 Ops/sec

Script Preparation code:

var array = [];
for (var i=0; i<3000; ++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;
}

var set = new Set(array);

function hasWithSet(needle) {
	return set.has(needle);
}

var map2 = new Map(array.map(item => [item, true]));

function hasWithMap2(needle) {
	return map2.has(needle);
}

Tests:

indexOf
for (var i=0; i<100; ++i) { hasWithIndexOf('404'); }
map
for (var i=0; i<100; ++i) { hasWithMap('404'); }
set
for (var i=0; i<100; ++i) { hasWithSet('404'); }
map2
for (var i=0; i<100; ++i) { hasWithMap2('404'); }