Run results for: Class instance method lookup vs function-created object method lookup (fork)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser: Chrome 92

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Class instance method lookup	3718291.0 Ops/sec
Function-created object method lookup	3443502.0 Ops/sec

Script Preparation code:

window.AClass = class {
  constructor() {
    this.c = () => 5;
  }
  
  b() {
    return 4;
  }
}

window.AFunc = function() {
  function c() {
    return 5;
  }
  
  return {
    b() {
      return 4;
    },
    c,
  };
};

Tests:

Class instance method lookup
const a = new AClass(); a.b(); a.c();
Function-created object method lookup
const a = new AFunc(); a.b(); a.c();

Run results for: Class instance method lookup vs function-created object method lookup (fork)

Class instance method lookup

Function-created object method lookup