Run results for: Return true vs empty body

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser: Chrome 53

Operating system: Windows 7

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
emptyFunc	9774589.0 Ops/sec
trueFunc	9822739.0 Ops/sec
undefinedFunc	3553377.8 Ops/sec
nullFunc	9695478.0 Ops/sec
notDefinedFunc	5249804.0 Ops/sec
definedFunc	5274334.5 Ops/sec
staticFunc	9485390.0 Ops/sec
localUndefinedFunc	9471848.0 Ops/sec
wrapped localUndefinedFunc function	9802709.0 Ops/sec

Script Preparation code:

var notDefined;
var defined = 1;

var emptyFunc = function() {};
var trueFunc = function() { return true; }
var undefinedFunc = function() { return undefined; }
var nullFunc = function() { return null; }
var notDefinedFunc = function() { return notDefined; }
var definedFunc = function() { return defined; }
var staticFunc = function() { return 1; }
var localUndefinedFunc = (function() {
  var notDefinedAgain;
  
  return function() {
  	return notDefinedAgain;
  }
})();

Tests:

emptyFunc
emptyFunc();
trueFunc
trueFunc();
undefinedFunc
undefinedFunc();
nullFunc
nullFunc();
notDefinedFunc
notDefinedFunc();
definedFunc
definedFunc();
staticFunc
staticFunc();
localUndefinedFunc
localUndefinedFunc();
wrapped localUndefinedFunc function
(localUndefinedFunc())

Run results for: Return true vs empty body

emptyFunc

trueFunc

undefinedFunc

nullFunc

notDefinedFunc

definedFunc

staticFunc

localUndefinedFunc

wrapped localUndefinedFunc function