Clone a function. Creates a new function that is exactly the same as the original, but without its properties. Essential if you want to construct a "callable object".

cloneFn.js

function cloneFn (fn) {
  var args,
      strFn = fn.toString();

  // Extract argument names
  // Match first occurence of "(<anything but end-parenthesis>)",
  // split it on "," and use as args
  args = [Function].concat(strFn
    .match(/\(([^\)]*)\)/)[1]
    .trim()
    .split(/\s*,\s*/)
    .filter(Boolean));

  // Extract function body
  // Find first "{" and last "}" and grab everything inbetween
  args.push(strFn.substring(strFn.indexOf('{') + 1, strFn.lastIndexOf('}')));

  // Create and return the new function
  return new (Function.bind.apply(Function, args))();
}