Run results for: Array loop vs hasownproperty

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36

Browser: Chrome 81

Operating system: Windows 7

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Array	285.8 Ops/sec
Object	184290.7 Ops/sec

Script Preparation code:

var object = {};
var array = [];

function randomIntFromInterval(min, max) { // min and max included 
  return Math.floor(Math.random() * (max - min + 1) + min);
}

for(let i = 0; i < 5000; i++){
	object['id'+i] = true;
  array.push(['id'+i, true]);
}

Tests:

Array
let lookupId = randomIntFromInterval(0, 5000); for(let i = 0; i < array.length; i++){ if(array[i][0] == 'id'+lookupId){ return array[i][1]; } }
Object
let lookupId = randomIntFromInterval(0, 5000); let lookupString = 'id'+lookupId; if(object.hasOwnProperty(lookupString)){ return object[lookupString]; }

Run results for: Array loop vs hasownproperty

Array

Object