Benchmark: forEach vs reduce with group by

Script Preparation code:

var keyGen = () => Math.random().toString(36).substring(2, 3);
var a = Array.from({length:100},()=>{ return { key: keyGen(), val: Math.random() } });
var b = {};

Tests:

forEach
a.forEach(e=>{ let t = b[e.key] || 0; b[e.key] = t + e.val; });
reduce
b = a.reduce((a,c)=> { let t = a[c.key] || 0; a[c.key] = t + c.val; return a; },{})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
reduce

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 13 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:153.0) Gecko/20100101 Firefox/153.0

Browser/OS: Firefox 153 on Windows

View result in a separate tab

forEach

488K/s

reduce

283K/s

View exact numbers

Test name	Executions per second
✓ forEach	487,878 Ops/sec
reduce	283,367 Ops/sec

forEach vs reduce with group by (version: 1)

Comparing performance of: `forEach vs reduce`

Created: 13 days ago by: Guest

Go to the latest result

forEach

reduce

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

forEach vs reduce with group by (version: 1)

Comparing performance of: forEach vs reduce

Created: 13 days ago by: Guest

Go to the latest result

forEach

reduce

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `forEach vs reduce`