Benchmark: defineproperty vs direct assignment

Tests:

a
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { Object.defineProperty(target, key+i, { get: function() {return _val;}, set: function(v) { target._v = v}, }); }
b
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { target[key+1] = undefined; }

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

31K/s

3K/s

Fastest: b (9.7x faster)

View exact numbers

✓ b: 30,909 ops/sec
• a: 3,171 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
b

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 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

View result in a separate tab

98K/s

5K/s

View exact numbers

Test name	Executions per second
✓ b	97,577 Ops/sec
a	4,524 Ops/sec

defineproperty vs direct assignment (version: 0)

Comparing performance of: `a vs b`

Created: 9 years ago by: Guest

Go to the latest result

a

b

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

defineproperty vs direct assignment (version: 0)

Comparing performance of: a vs b

Created: 9 years ago by: Guest

Go to the latest result

a

b

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 14 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `a vs b`