Run results for: set.add vs array.push Fabien

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Browser: Chrome 96

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
conditional array.push	663958.1 Ops/sec
set.add	699804.7 Ops/sec

Script Preparation code:

var array = [];
var set = new Set();
var map = new Map();

var existingItem1 = {};
var existingItem2 = {};
var existingItem3 = {};
var newItem1 = {};
var newItem2 = {};
var newItem3 = {};

for (let i = 0, item; i < 100; i++) {
  item = {index: i};
  array.push(item);
  set.add(item);
  map.set(item, 0);
}

array.push(existingItem1, existingItem2, existingItem3);
set.add(existingItem1); set.add(existingItem2); set.add(existingItem3);
map.set(existingItem1, 0); map.set(existingItem2, 0); map.set(existingItem3, 0);

Tests:

conditional array.push
array.push(existingItem1); array.push(newItem1); array.push(existingItem2); array.push(newItem2); array.push(existingItem3); array.push(newItem3);
set.add
set.add(existingItem1); set.add(newItem1); set.add(existingItem2); set.add(newItem2); set.add(existingItem3); set.add(newItem3);

Run results for: set.add vs array.push Fabien

conditional array.push

set.add