Run results for: Default parameter vs Empty parameter

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Browser: Chrome 54

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Default parameter	10110871.0 Ops/sec
Empty parameter	10921360.0 Ops/sec

Script Preparation code:

function foo(arg = false) {
  return (!arg);
}

function bar(arg) {
  return (!arg);
}

Tests: