Benchmark: Lodash "unionBy"vs "uniqBy"

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Script Preparation code:

var users = [
  { 'name': 'barney',  'age': 36 },
  { 'name': 'pebbles', 'age': 5 }
];

var newUsers = [
  { 'name': 'fred',    'age': 40 },
  { 'name': 'barney',  'age': 36 },
  { 'name': 'pebbles', 'age': 2 }
];

for(let i = 0; i < 2000; i++) {
  var newUser = { 'name': 'user_' + i, 'age': Math.floor(Math.random() * i) };
  newUsers.push(newUser);
}

for(let i = 0; i < 2000; i++) {
  var newUser = { 'name': 'user_' + i, 'age': Math.floor(Math.random() * i) };
  users.push(newUser);
}

Tests:

unionBy
const unionUsers2 = _.unionBy(newUsers, users, 'age');
uniqBy
const unionUsers1 = _.uniqBy(newUsers.concat(users), 'age');

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

uniqBy

11K/s

unionBy

11K/s

View exact numbers

✓ uniqBy: 11,448 ops/sec
• unionBy: 10,595 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
unionBy
uniqBy

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

uniqBy

14K/s

unionBy

12K/s

View exact numbers

Test name	Executions per second
✓ uniqBy	13,591 Ops/sec
unionBy	12,448 Ops/sec

Lodash "unionBy"vs "uniqBy" (version: 0)

Comparing performance of: `unionBy vs uniqBy`

Created: 3 years ago by: Guest

Go to the latest result

unionBy

uniqBy

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Lodash "unionBy"vs "uniqBy" (version: 0)

Comparing performance of: unionBy vs uniqBy

Created: 3 years ago by: Guest

Go to the latest result

unionBy

uniqBy

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `unionBy vs uniqBy`