Run results for: map vs. for vs. for in vs. forEach - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
map	38556696.0 Ops/sec
for in	4239862.5 Ops/sec
for	78846720.0 Ops/sec
forEach	41818144.0 Ops/sec

Script Preparation code:

var a = ["foo", "bar", "baz", "boom"]

Tests:

map
var b = a.map(function(c) { return c; });
for in
var b = []; for (var i in a) { b.push(a[i]); }
for
var b = []; for (var i = 0; i < a.length; i++) { b.push(a[i]); }
forEach
var b = []; a.forEach(function(c) { b.push(c); });