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Run results for:
hasOwnProperty vs Object.keys (longer and more options)
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<iframe src="https://measurethat.net/Embed?id=593372" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 Edg/134.0.0.0
Browser:
Chrome 134
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
hasOwnProperty
43399.1 Ops/sec
for (var k=Object.keys(props), [...]
99700.2 Ops/sec
for (var k_i=0;k_i<keys_l;k_i++
100077.6 Ops/sec
for (const key in Object.keys(props))
293.4 Ops/sec
Script Preparation code:
var props = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:1,i:1,j:1,k:1,l:1,m:1,n:1,o:1,p:1,q:1,r:1,s:1,t:1,u:1,v:1,w:1,x:1,y:1,z:1}; for (var i=0;i<1000;i++){ var key = i.toString(); props[i]=i; }
Tests:
hasOwnProperty
for (const p in props) { if (Object.prototype.hasOwnProperty.call(props, p)) { props[p] = 2; } }
for (var k=Object.keys(props), [...]
for (var k=Object.keys(props), l=k.length, i=0; i<l; i++) { props[k[i]] = 2; }
for (var k_i=0;k_i<keys_l;k_i++
const keys = Object.keys(props); const keys_l = keys.length; for (var k_i=0;k_i<keys_l;k_i++){ const k=keys[k_i] props[k] = 2 }
for (const key in Object.keys(props))
for (const key in Object.keys(props)){ props[key] = 2 }