Run results for: indexOf vs map

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Browser: Chrome 54

Operating system: Windows 7

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
indexOf	18320.2 Ops/sec
map with forEach	1924.5 Ops/sec
map with loop	2536.6 Ops/sec

Script Preparation code:

function hasWithIndexOf(needle, haystack) {
	return haystack.indexOf(needle) !== -1;
}

function hasWithMapForEach(needle, haystack) {
	var map = {};
	haystack.forEach(item => map[item] = true);
	return map[needle];
}

function hasWithMapLoop(needle, haystack) {
	var map = {};
	for (var i=0, len=haystack.length; i<len; ++i) {
    	map[haystack[i]] = true;
    }
	return map[needle];
}
                     
var testArray = ['001', '002', '003', '004', '005', '006', '007', '008', '009', '010', '011', '012', '013', '014', '015', '016', '017', '018', '019', '020'];

Tests:

indexOf
for (var i=0; i<100; ++i) { hasWithIndexOf('000', testArray); }
map with forEach
for (var i=0; i<100; ++i) { hasWithMapForEach('000', testArray); }
map with loop
for (var i=0; i<100; ++i) { hasWithMapLoop('000', testArray); }

Run results for: indexOf vs map

indexOf

map with forEach

map with loop