function(){} vs new Function() vs eval(function(){}) (v4)

Revision 4 of this benchmark created by siR on

Description

https://developer.mozilla.org/en/JavaScript/Reference/Functions_and_function_scope says

Functions defined by function expressions and function declarations are parsed only once, while those defined by the Function constructor are not. That is, the function body string passed to the Function constructor must be parsed every time it is evaluated. Although a function expression creates a closure every time, the function body is not reparsed, so function expressions are still faster than "new Function(...)". Therefore the Function constructor should be avoided whenever possible.

Which sounds bad.

Changed the code so that the functions are created inside of the test scenario and not the preparation code

Test runner

Ready to run.

Testing in
TestOps/sec
Function expression
var fn = new Function('return 1 + 2;');
ready
Function constructor
var fn = function() {
 return 1 + 2;
};
ready
A function created with eval()
eval('var fn = function(){return 1 + 2;}');
ready

Revisions

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