Run results for: IIFE vs Normal function

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36

Browser: Chrome 80

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
iifeFn	2473.7 Ops/sec
normalFn	1602.3 Ops/sec

Script Preparation code:

var iifeFn = (() => {
  return window.location !== window.parent.location;
})();

var normalFn = () => {
  return window.location !== window.parent.location;
};

Tests:

iifeFn
console.log(iifeFn)
normalFn
console.log(normalFn())