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Run results for:
forEach vs reduce vs map + filter vs for
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36
Browser:
Chrome 132
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
forEach
1239.7 Ops/sec
reduce
1842.4 Ops/sec
map + filter
12659.4 Ops/sec
for
954.6 Ops/sec
Script Preparation code:
var arr = []; for (var i = 0; i < 12345; i++) { arr[i] = i; } var arrForEach = [], arrReduce = [], arrForLoop = [];
Tests:
forEach
arr.forEach(item => { if(item % 2 === 0) arrForEach.push({value: item}); });
reduce
arr.reduce((lastValue, item) => { if(item % 2 === 0) lastValue.push({value: item}); return lastValue }, arrReduce);
map + filter
arr.filter(item => item % 2 === 0).map(item => ({value: item}));
for
for (var j = 0; j < arr.length; j++) { if(arr[j] % 2 === 0) arrForLoop.push({value: arr[j]}); }