Run results for: Create an array with unique values - Javascript Array.reduce/Array.indexOf vs Lodash Uniq vs custom fn vs custom2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36

Browser: Chrome 102

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Javascript Array.reduce/Array.indexOf	59695.1 Ops/sec
object literal/res.push(arr[i]);	371876.7 Ops/sec
object literal/res.length	370664.3 Ops/sec

Script Preparation code:

var itemsCount = 1e2;
var items = Array.from({ length: itemsCount }, () => Math.floor(Math.random() * itemsCount));

Tests:

Javascript Array.reduce/Array.indexOf
items.reduce((list, item) => list.indexOf(item) > -1 ? list : [...list, item], []);
object literal/res.push(arr[i]);
function unique(arr) { var hash = {}, result = []; for ( var i = 0, l = arr.length; i < l; ++i ) { if ( !hash.hasOwnProperty(arr[i]) ) { hash[ arr[i] ] = true; result.push(arr[i]); } } return result; } unique(items)
object literal/res.length
function unique(arr) { var hash = {}, result = []; for ( var i = 0, l = arr.length; i < l; ++i ) { if ( !hash.hasOwnProperty(arr[i]) ) { hash[ arr[i] ] = true; result[result.length] = arr[i]; } } return result; } unique(items)