Get all the argument names from a given function

bad-idea.js

// Get the argument names from a given function
Function.prototype.args = function() {
  // First match everything inside the function argument parens
  var args = this.toString().match(/function\s.*?\(([^)]*)\)/)[1];

  // Split the arguments string into an array comma delimited
  return args.split(", ").map(function(arg) {
    // Ensure no inline comments are parsed and trim the whitespace
    return arg.replace(/\/\*.*\*\//, "").trim();
  }).filter(function(arg) {
    // Ensure no undefineds are added
    return arg;
  });
};

choke-me.js

// Potentially IE 6-friendly
// Get the argument names from a given function.
Function.prototype.args = function() {
  var i, arg;
  // Store ordered list of all the argument names.
  var names = [];
  // First match everything inside the function argument parens. Split the
  // arguments string into an array comma delimited.
  var args = this.toString().match(/function\s.*?\(([^)]*)\)/)[1].split(", ");

  // Iterate over all arguments.
  for (i = 0; i < args.length; i++) {
    arg = args[i];

    // Ensure no inline comments are parsed.
    if (arg = arg.replace(/\/\*.*\*\//, "")) {
      // Trim the whitespace and ensure no undefineds are added.
      names.push(arg.replace(/^\s?|\s?$/g, ""));
    }
  }

  return names;
};

example.js

// Normal arguments
function(lol, hi) {

}.args(); // ["lol", "hi"]

// Arguments with inline comments
function(/* hahaha */lol, /*wut wut */hi) {

}.args(); // ["lol", "hi"]

// No arguments
function() {

}.args(); // []

Please Do Not Use This Ever

Unless you really really really really really need to

Looks great! Can’t wait to use this on my next project!

javascript kwargs here I come

Now I can enforce strict argument names! Thanks Tim!

p.s. those are called parameters :)

Not in my world.

I'M HAVING YRUBLE GETTING THS 2 WORK ON MY TALKBOY PRO. PLZ FIX.

WAITNG UR REPLY.

please make this as jaquery plugin