Run results for: hasOwnProperty vs Object.keys (longer and more options)

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

for (var k_i=0;k_i<keys_l;k_i++

100K/s

for (var k=Object.keys(props), [...]

100K/s

hasOwnProperty

43K/s

for (const key in Object.keys(props))

293/s

View exact numbers

Test name	Executions per second
✓ for (var k_i=0;k_i<keys_l;k_i++	100,078 Ops/sec
for (var k=Object.keys(props), [...]	99,700 Ops/sec
hasOwnProperty	43,399 Ops/sec
for (const key in Object.keys(props))	293 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 }