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Run results for:
Object key, typeof === 'function' vs startsWith 'on'
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
7 months ago
Test name
Executions per second
typeof key === function
1011.8 Ops/sec
startsWith on
1126.1 Ops/sec
HTML Preparation code:
<!--your preparation HTML code goes here-->
Script Preparation code:
const attrs = { class: 'test', onclick: e => console.log(e), style: 'color: red;', onfocus: e => console.log(e), }; const count = 1000;
Tests:
typeof key === function
for(let i = 0; i < count; i++) { const el = document.createElement('div'); for(const [k, v] of Object.entries(attrs)) { if(typeof k === 'function') el[k] = v; else el.setAttribute(k, v); } }
startsWith on
for(let i = 0; i < count; i++) { const el = document.createElement('div'); for(const [k, v] of Object.entries(attrs)) { if(k.startsWith('on')) el[k] = v; else el.setAttribute(k, v); } }