Run results for: Object.keys for length checking

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:130.0) Gecko/20100101 Firefox/130.0

Browser: Firefox 130

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

obj 1k keys

33.0M/s

obj 10 keys

12.6M/s

obj 100 keys

3.2M/s

obj 500 keys

385K/s

View exact numbers

Test name	Executions per second
✓ obj 1k keys	33,003,244 Ops/sec
obj 10 keys	12,639,297 Ops/sec
obj 100 keys	3,156,491 Ops/sec
obj 500 keys	385,397 Ops/sec

Script Preparation code:

var obj10 = {};
var obj100 = {};
var obj500 = {};
var obj1000 = {};

for (let i=0; i < 10; i++) {
  obj10[`key${i}`] = i;
}
for (let i=0; i < 100; i++) {
  obj100[`key${i}`] = i;
}
for (let i=0; i < 500; i++) {
  obj500[`key${i}`] = i;
}
for (let i=0; i < 1000; i++) {
  obj500[`key${i}`] = i;
}

Tests:

obj 10 keys
Object.keys(obj10).length
obj 100 keys
Object.keys(obj100).length
obj 500 keys
Object.keys(obj500).length
obj 1k keys
Object.keys(obj1000).length