Run results for: Array pop-push vs last index element check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
pop-push check	4980903.0 Ops/sec
last-index check	560829.2 Ops/sec

Script Preparation code:

var arr1 = [0,1,2,3,4,5,6,7,8,9];
var arr2 = [];

function pushPopLast(arr, n) {
  const element = arr.pop();
  arr.push(element);
  return element === n;
}

function indexLast(arr, n) {
  const element = arr[arr.lenght - 1];
  return element === n;
}

Tests:

pop-push check
pushPopLast(arr1, 8); pushPopLast(arr1, 9); pushPopLast(arr2, 9);
last-index check
indexLast(arr1, 8); indexLast(arr1, 9); indexLast(arr2, 9);

Run results for: Array pop-push vs last index element check

Comparing pop-push method vs last index check for an array element

pop-push check

last-index check