Run results for: indexOf(needle) vs includes(needle) vs (needle in map) vs map.has(needle) (over 10,000 records)

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 13904.77.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.147 Safari/537.36

Browser: Chrome 91

Operating system: Chrome OS 13904.77.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
array.indexOf	547.1 Ops/sec
map.has	49208.5 Ops/sec
array.includes	25988.4 Ops/sec
in obj	52061.6 Ops/sec

Script Preparation code:

var array = []
for (var i=0; i<10000; ++i) {
  	array.push('00' + i)
}

function hasWithIndexOf(needle) {
	return array.indexOf(needle) !== -1
}

function hasWithIncludes(needle) {
	return array.includes(needle)
}

var map = new Map
array.forEach(item => map[item] = true)


var obj = {}
array.forEach(item => obj[item] = true)

function hasWithMap(needle) {
  return map.has(needle)
}

function hasWithIn(needle) {
	return needle in map
}

Tests:

array.indexOf
for (var i=0; i<100; ++i) { hasWithIndexOf('404'); }
map.has
for (var i=0; i<100; ++i) { hasWithMap('404'); }
array.includes
for (var i=0; i<100; ++i) { hasWithIncludes('404'); }
in obj
for (var i=0; i<100; ++i) { hasWithIn('404'); }

Run results for: indexOf(needle) vs includes(needle) vs (needle in map) vs map.has(needle) (over 10,000 records)

array.indexOf

map.has

array.includes

in obj