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Run results for:
JS String '+' same v.s. different strings
Is there a difference in performance over many iterations of string concatenation if the string being added is the same or different each time?
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<iframe src="https://measurethat.net/Embed?id=502460" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/109.0
Browser:
Firefox 109
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Same string added each loop
360294.2 Ops/sec
Different string added each loop
10157.2 Ops/sec
Script Preparation code:
var nLoops = 1000;
Tests:
Same string added each loop
var fragmentToAdd = Math.random(); var str = ''; for (var i = 0; i < nLoops; i++) { // Just to equalize the work done in each test Math.random(); str += fragmentToAdd; }
Different string added each loop
var str = ''; for (var i = 0; i < nLoops; i++) { str += Math.random(); }