Run results for: noop vs conditional execution

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
conditional	17073838.0 Ops/sec
no_Op	828563.2 Ops/sec

Script Preparation code:

var no_Op = function() {};
var checkMe = [
  void 0,
  function(x, y) {
    x.n += y;
  },
  function(x, y) {
    x.n += y;
  },
  void 0,
  function(x,y) {
    x.n += y;
  },
  void 0,
  function(x, y) {
  	x.n += y;
  },
  void 0
];
var runMe = checkMe.map(fn => fn || no_Op);

Tests:

conditional
const accumulator = {n: 0}; for (let i = 0, fn; i < checkMe.lenght; i++) { fn = checkMe[i]; if (fn) { fn(accumulator, i); } }
no_Op
const accumulator = {n: 0}; for (let i = 0; i < runMe.length; i++) { runMe[i](accumulator, i); }

Run results for: noop vs conditional execution

Is it faster to run a noop (no-op, no op) function in javascript or is it faster to check if a function exist before calling it? let's find out!

conditional

no_Op