javascript argument check benchmarks.

gistfile1.js

LOOP = 10000000;
var start, end;

// logging
function log(msg){
	return console.log(msg);
}

function checkStrTernary(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret = (arg=='foo')? arg : 'bar';
	}
	end = new Date();
	log('[checkStrTernary]\t' + (end-start));
}


function checkStrIf(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret;
		if(arg=='foo'){
			ret = arg;
		} else {
			ret =  'bar';
		}
	}
	end = new Date();
	log('[checkStrIf]\t'+ (end-start));
}

function checkArgsLogicalAdd(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret =  arg || 'bar';
	}
	end = new Date();
	log('[checkArgsLogicalAdd]\t ' + (end-start));

}
function checkArgsTernary(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret =  arg ? arg : 'bar';
	}
	end = new Date();
	log('[checkArgsTernary]\t ' + (end-start));

}
function checkArgsIf(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret;
		if(arg) {
			ret = arg;
		} else {
			ret = 'bar';
		}
	}
	end = new Date();
	log('[checkArgsIf] \t' + (end-start));
}
function checkArgsIf2(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		if(!arg) { arg = 'bar';}
	}
	end = new Date();
	log('[checkArgsIf2] \t' + (end-start));
}


function checkNullTernary(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret = (arg!=null)? arg : 'bar';
	}
	end = new Date();
	log('[checkNullTernary] \t' + (end-start));
}

function checkNullIf(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret;
		if(arg != null){
			ret = arg;
		} else {
			ret = 'bar';
		}
	}
	end = new Date();
	log('[checkNullIf] \t' + (end-start));
}


function checkTypeTernary(arg){
	start = new Date();
	for(var i=0; i<LOOP; i++){
		var ret = (typeof(arg) != 'undefined')? arg : 'bar';
	}
	end = new Date();
	log('[checkTypeTernary] \t' + (end-start));
}

function checkTypeIf(arg){
	var ret;
	start = new Date();
	for(var i=0; i<LOOP; i++){
		if(typeof arg != 'undefined'){
			ret = arg;
		} else {
			ret = 'bar';
		}
	}
	end = new Date();
	log('[checkTypeIf] \t' + (end-start));
}

/*
 * Testing
 */
(function(arg){
	checkStrTernary(arg);
 	checkStrIf(arg);
	checkArgsLogicalAdd(arg)
 	checkArgsTernary(arg);
	checkArgsIf(arg);
	checkArgsIf2(arg);
	checkNullTernary(arg);
 	checkNullIf(arg);
	checkTypeTernary(arg);
 	checkTypeIf(arg);
})(true /*false*/);