Run results for: CompareFor20190430

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.2

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

for

113K/s

for optimized 1

110K/s

for optimized 2

110K/s

forEach

102K/s

View exact numbers

Script Preparation code:

var saved = new Array(1000).fill(null).map((v, item) => ({item}));

Tests:

for
var savedMap = {}; for (var i = 0; i < saved.length; i++) { savedMap[saved[i].item] = saved[i]; }
forEach
var savedMap = {}; saved.forEach(item => { savedMap[item.item] = item; });
for optimized 1
var savedMap = {}; for (var i = 0, l = saved.length; i < l; i++) { savedMap[saved[i].item] = saved[i]; }
for optimized 2
var savedMap = {}; for (var i = 0, l = saved.length; i < l; i++) { var item = saved[i]; savedMap[item.item] = item; }