Benchmark: Set vs Object vs Map vs array

Script Preparation code:

const array = Array.from({ length: 10000 }, (_, idx) => idx);
const set = new Set(array);
const object = Object.fromEntries(array.map((x) => [x, true]));
const map = new Map(Object.entries(object));

Tests:

Set
set.has(0); set.has(42); set.has(69); set.has(9999); set.has(520); set.has(1314); set.has(168); set.has(19); set.has(4); set.has(10000);
Object
0 in object; 42 in object; 69 in object; 9999 in object; 520 in object; 1314 in object; 168 in object; 19 in object; 4 in object; 10000 in object;
Map
map.has(0); map.has(42); map.has(69); map.has(9999); map.has(520); map.has(1314); map.has(168); map.has(19); map.has(4); map.has(10000);
Array
array.includes(0); array.includes(42); array.includes(69); array.includes(9999); array.includes(520); array.includes(1314); array.includes(168); array.includes(19); array.includes(4); array.includes(10000);

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Firefox 6 runs

Object

2006.3M/s

Map

211.8M/s

Set

206.0M/s

Array

55K/s

Fastest: Object (36192.3x faster)

View exact numbers

✓ Object: 2,006,288,256 ops/sec
• Map: 211,826,976 ops/sec
• Set: 205,980,864 ops/sec
• Array: 55,434 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
Set
Object
Map
Array

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0

Browser/OS: Firefox 149 on Windows

View result in a separate tab

Object

1997.2M/s

Map

210.0M/s

Set

208.5M/s

Array

46K/s

View exact numbers

Test name	Executions per second
✓ Object	1,997,188,480 Ops/sec
Map	209,962,624 Ops/sec
Set	208,454,016 Ops/sec
Array	45,726 Ops/sec

Set vs Object vs Map vs array (version: 1)

Compare the speed to retrieve a value from three data structures that can be used for boolean referencing; i.e. for mapping enabled settings.

Comparing performance of: `Set vs Object vs Map vs Array`

Created: one year ago by: Guest

Go to the latest result

Set

Object

Map

Array

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Set vs Object vs Map vs array (version: 1)

Compare the speed to retrieve a value from three data structures that can be used for boolean referencing; i.e. for mapping enabled settings.

Comparing performance of: Set vs Object vs Map vs Array

Created: one year ago by: Guest

Go to the latest result

Set

Object

Map

Array

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Set vs Object vs Map vs Array`