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Run results for:
3 different for loops vs foreach() vs some() vs for..of
Compare loop performance
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0
Browser:
Chrome 145
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 months ago
Test name
Executions per second
for (dynamic length)
4099466.0 Ops/sec
foreach
7270996.5 Ops/sec
some
7500228.5 Ops/sec
for..of
895189.4 Ops/sec
for (static length)
5537069.0 Ops/sec
backward for
6185748.0 Ops/sec
Script Preparation code:
var array = new Array(100);
Tests:
for (dynamic length)
var i = 0; for (; i < array.length; ++i) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
for (static length)
var len = array.length var i = 0; for (; i < len; ++i) { array[i]; }
backward for
var i = array.length - 1 for (; i >= 0; --i) { array[i]; }