Benchmark: Object key, typeof === 'function' vs startsWith 'on'

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); } }

Rendered benchmark preparation results:

Previous results

Test case name	Result
typeof key === function
startsWith on

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Mac OS X 10.15.7

Test name	Executions per second
typeof key === function	602.4 Ops/sec
startsWith on	1043.2 Ops/sec

Related benchmarks:

Object key, typeof === 'function' vs startsWith 'on' (version: 1)