Benchmark: reduce collection

Script Preparation code:

var collection = Array(10000).fill().map(() => ({ 
  section: { id: 'id_' + ~~(Math.random()*10) }, 
  user: { id: 'id_' + ~~(Math.random()*10) },  
}))

Tests:

mutate reducer 1
var result = collection.reduce((acc, { section, user }) => { if (!acc[section.id]) { acc[section.id] = [user.id]; return acc; } acc[section.id].push(user.id); return acc; }, {});
mutate reducer 2
var result = collection.reduce((acc, { section, user }) => { acc[section.id] = acc[section.id] || []; acc[section.id].push(user.id); return acc; }, {});
mutate reducer 3
var result = collection.reduce((acc, { section, user }) => { if (!acc[section.id]) { acc[section.id] = []; } acc[section.id].push(user.id); return acc; }, {});
shallow copy reducer
var result = collection.reduce((acc, { section, user }) => ({ ...acc, [section.id]: [...(acc[section.id] || []), user.id] }), {});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
mutate reducer 1
mutate reducer 2
mutate reducer 3
shallow copy reducer

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

Browser/OS: Chrome 76 on Linux

View result in a separate tab

Test name	Executions per second
mutate reducer 1	1395.8 Ops/sec
mutate reducer 2	1093.4 Ops/sec
mutate reducer 3	1436.2 Ops/sec
shallow copy reducer	46.5 Ops/sec

reduce collection (version: 0)

some reducer over collection test

Comparing performance of: mutate reducer 1 vs mutate reducer 2 vs mutate reducer 3 vs shallow copy reducer

Created: 4 years ago by: Registered User

Jump to the latest result

mutate reducer 1

mutate reducer 2

mutate reducer 3

shallow copy reducer

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A