new Function() with variable parameters

Question

I need to create a function with variable number of parameters using new Function() constructor. Something like this:

args = [\'a\', \'b\'];
bod         


        

Answer 1

new Function(...)

Declaring function in this way causes the function not to be compiled, and is potentially slower than the other ways of declaring functions.

Let is examine it with JSLitmus and run a small test script:

What I did above is create a function expression and function constructor performing same operation. The result is as follows:

FireFox Performance Result

IE Performance Result

Based on facts I recommend to use function expression instead of function constructor

var a = function() {
 var result = 0;
 for(var index=0; index < arguments.length; index++) {
  result += arguments[index];
 }
 return result;
 }
alert(a(1,3));