optional args

JavaScript performance comparison

Revision 2 of this test case created by ainthek on 23rd February 2013

Comparison of various "optional argument" implementations. Staring with trivial.

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Test Ops/sec

Testing in unknown unknown
Test	Ops/sec
arguments[0] and void	`function test() { var a = arguments[0] !== (void 0) ? arguments[0] : "foo"; } //this is what will be generated by #traceur with es6 option`	pending…
arguments[0] and undefined	`function test() { var a = arguments[0] !== undefined ? arguments[0] : "foo"; } // same with undefined (eliminating void evaluation)`	pending…
ad-hoc	`function test(a) { a != null \|\| (a = "foo"); } //ad-hoc impl., null & undefined treated as missing arg, "" as valid value`	pending…

arguments[0] and void

function test() {
  var a = arguments[0] !== (void 0) ? arguments[0] : "foo";
}
//this is what will be generated by #traceur with es6 option

pending…

arguments[0] and undefined

function test() {
  var a = arguments[0] !== undefined ? arguments[0] : "foo";
}
// same with undefined (eliminating void evaluation)

pending…

ad-hoc

function test(a) {
  a != null || (a = "foo"); 
}
//ad-hoc impl., null & undefined treated as missing arg, "" as valid value

pending…

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