Run results for: Lodash "unionWith" "unionBy" 4

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36

Browser: Chrome 91

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
unionWith1	62.3 Ops/sec
unionBy	3220.2 Ops/sec
unionWith2	41.2 Ops/sec

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);
}

Tests:

unionWith1
const unionUsers1 = _.unionWith(newUsers, users, (newUser, user) => newUser.name === user.name);
unionBy
const unionUsers2 = _.unionBy(newUsers, users, (user) => user.name);
unionWith2
const unionUsers1 = _.unionWith(newUsers, users, (newUser, user) => newUser.name === user.name);

Run results for: Lodash "unionWith" "unionBy" 4

unionWith1

unionBy

unionWith2