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Run results for:
Event listener anonymous function vs named inline function vs external function
This test compares performance of addEventListener(), when it's passed anonymous function, named inline function and function declared beforehand.
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<iframe src="https://measurethat.net/Embed?id=608020" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 8.1.0; ASUS_X00HD) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.7103.125 Mobile Safari/537.36
Browser:
Chrome Mobile 136
Operating system:
Android 8.1.0
Device Platform:
Mobile
Date tested:
one year ago
Anonymous function
5/s
External function
2/s
Named function as parameter
2/s
View exact numbers
Test name
Executions per second
✓
Anonymous function
5 Ops/sec
External function
2 Ops/sec
Named function as parameter
2 Ops/sec
HTML Preparation code:
<div id="element"></div>
Script Preparation code:
var element = document.getElementById('element'); var iterations = 100; var dummyString = 'Hello';
Tests:
Anonymous function
for (var i = 0; i < iterations; i++) { element.addEventListener('click', function() { element.textContent = dummyString; }); }
Named function as parameter
for (var i = 0; i < iterations; i++) { element.addEventListener('click', function setText() { element.textContent = dummyString; }); }
External function
function setText() { 'use strict'; element.textContent = dummyString; } for (var i = 0; i < iterations; i++) { element.addEventListener('click', setText); }