Run results for: reduce-vs-uniqBy

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Array.prototype.reduce()	1618217.0 Ops/sec
_.uniqBy	417264.6 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var workOrders = _.range(_.random(100)).map(x => ({
  assignee: {
    id: _.random(1, 10),
  },
}));

Tests:

Array.prototype.reduce()
workOrders.reduce((accumulator, workOrder) => { if (workOrder.assignee === null) { return accumulator; } const assigneeExists = accumulator.some(assignee => assignee.id === workOrder.assignee.id); return assigneeExists === true ? accumulator : [...accumulator, workOrder.assignee]; }, []);
_.uniqBy
_(workOrders).map('assignee').filter().uniqBy('id').value();