Question

Here is a simple example of what I want to be able to do.

I want a function returnFunctions which will take an integer N as an argument and will define the following functions:

func1(x) = x
func2(x) = 2*x
...
funcN(x) = n*x

How can I do something like this in javascript?

Answer 1

You can do like this:

function returnFunctions(n) {
  for (var i = 1; i <= n; i++) {
    (function(i){
      window['func' + i] = function(x) { return x * i; };
    })(i);
  }
}

Demo: http://jsfiddle.net/Guffa/H4juA/

However, it’s not at all certain that it’s the best solution for what you are trying to accomplish, but the question doesn’t contain any information about that…