Is there a way to create a function from a string with javascript?

Question

For example;

var s = "function test(){
  alert(1);
}";

var fnc = aMethod(s);

If this is the string, I want a function that's called fnc. And fnc(); pops alert screen.

eval("alert(1);") doesnt solve my problem.

Answer 1

I added a jsperf test for 4 different ways to create a function from string :

• Using RegExp with Function class

  var func = "function (a, b) { return a + b; }".parseFunction();

• Using Function class with "return"

  var func = new Function("return " + "function (a, b) { return a + b; }")();

• Using official Function constructor

  var func = new Function("a", "b", "return a + b;");

• Using Eval

  eval("var func = function (a, b) { return a + b; };");

http://jsben.ch/D2xTG

2 result samples: