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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 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0
Browser:
Firefox 147
Operating system:
Linux
Device Platform:
Desktop
Date tested:
3 months ago
Test name
Executions per second
for (dynamic length)
22512242.0 Ops/sec
foreach
11572076.0 Ops/sec
some
15620258.0 Ops/sec
for..of
1995145.9 Ops/sec
for (static length)
20905012.0 Ops/sec
backward for
21120098.0 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]; }