Run results for: reduce-vs-uniqBy 1234

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36

Browser: Chrome 88

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.prototype.reduce()	307711.6 Ops/sec
_.uniqBy	154006.4 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[1].has(workOrder.assignee.id); if (assigneeExists) return accumulator; accumulator[1].add(workOrder.assignee.id); accumulator[0].push(workOrder.assignee); return accumulator; }, [[], new Set()]);
_.uniqBy
_(workOrders).map('assignee').filter().uniqBy('id').value();