Benchmark: array push vs reduce

Script Preparation code:

var oldData = { item1: 'olditem1', item2: 'olditem2', item3: 'unchanged' };
var newData = { item1: 'newitem1', item3: 'unchanged', item4: 'something else' };

Tests:

array push
const result = []; Object.entries(oldData).forEach(([key, oldValue]) => { const newValue = newData[key]; if (typeof newValue === 'undefined' || oldValue !== newValue) { result.push(key); } });
optimized push
const result = []; Object.keys(oldData).forEach((key) => { if (oldData[key] !== newData[key]) { result.push(key); } });
reduce
const result = Object.entries(oldData).reduce((accum, [key, oldValue]) => { const newValue = newData[key]; if (typeof newValue === 'undefined' || oldValue !== newValue) { return [...accum, key]; } return accum; }, []);
optimized reduce
const result = Object.keys(oldData).reduce((accum, key) => { if (oldData[key] !== newData[key]) { accum.push(key); } return accum; }, []);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array push
optimized push
reduce
optimized reduce

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array push	2970853.0 Ops/sec
optimized push	2709001.0 Ops/sec
reduce	3666653.0 Ops/sec
optimized reduce	2800936.0 Ops/sec

array push vs reduce (version: 0)

Comparing performance of: array push vs optimized push vs reduce vs optimized reduce

Created: one year ago by: Guest

Jump to the latest result

array push

optimized push

reduce

optimized reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A