Run results for: union vs concat+uniq

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
concat+uniq	252869.0 Ops/sec
union	121192.9 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js"></script>

Script Preparation code:

var AA = [[1, 2, 3, 4, 5],[1, 3, 3, 4, 5],[1, 8, 3, 4, 9],[1, 4, 3, 4, 5],[1, 1, 3, 4, 5],[1, 6, 7, 4, 5],[1, 7, 7, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5],[1, 4, 3, 4, 5]]

Tests:

concat+uniq
var a = AA.reduce((accum, x) => { return accum.concat(x); }) var b = _.uniq(a)
union
var a = AA.reduce((accum, x) => { return _.union(accum, x); }) var b = a;