Benchmark: Make array of primitives unique

Script Preparation code:

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

var arr = [];
for(let i = 0; i < 10000; i++) {
	  arr.push(getRandomInt(1000));
}

Tests:

Array.findIndex
const compare = (a,b) => a === b; arr.filter((item, idx) => arr.findIndex(compare) === idx);
Array.indexOf
arr.filter((item, idx) => arr.indexOf(item) === idx);
Array.from(new Set(array))
Array.from(new Set(arr));
Object-filter
const obj = {}; arr.filter((item) => { if(!obj[item]){ obj[item] = true; return true; } return false; });
Object-values
Object.values(arr.reduce((acc, item) => { if(!acc[item]){ acc[item] = item; } return acc; }, {}));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.findIndex
Array.indexOf
Array.from(new Set(array))
Object-filter
Object-values

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser/OS: Chrome 92 on Windows

View result in a separate tab

Test name	Executions per second
Array.findIndex	1.0 Ops/sec
Array.indexOf	46.2 Ops/sec
Array.from(new Set(array))	3524.6 Ops/sec
Object-filter	8591.2 Ops/sec
Object-values	9584.6 Ops/sec

Make array of primitives unique (version: 1)

Comparing performance of: Array.findIndex vs Array.indexOf vs Array.from(new Set(array)) vs Object-filter vs Object-values

Created: 2 years ago by: Registered User

Jump to the latest result

Array.findIndex

Array.indexOf

Array.from(new Set(array))

Object-filter

Object-values

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A