Run results for: function vs class with external declarations

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

class

315K/s

function expression

312K/s

function declaration

312K/s

View exact numbers

Test name	Executions per second
✓ class	314,660 Ops/sec
function expression	312,350 Ops/sec
function declaration	312,081 Ops/sec

Script Preparation code:

var arr = 1
var functionExpression = function(item) {
  arr  = item
};
function functionDeclaration(item) {
  arr  = item
}
class Test {
  constructor() {  }
  addItem(item){
      arr  = item
  }
}
var _test = new Test()

function functionClass(item) {
  _test.addItem(item);
}

Tests:

function declaration
arr =2 for (let i = 1; i < 10000; i++) { functionDeclaration(i); }
function expression
arr =1 for (let i = 1; i < 10000; i++) { functionExpression(i); }
class
arr =1 for (let i = 1; i < 10000; i++) { _test.addItem(i); }