How to find JavaScript functions in a JavaScript (.js) file?

Question

I need to find or list out all the JavaScript methods in a .js file.

Answer 1

You can programmatically get a list of all the user-defined global functions as follows:

var listOfFunctions = [];

for (var x in window) {

  if (window.hasOwnProperty(x) && 
      typeof window[x] === 'function' &&
      window[x].toString().indexOf('[native code]') > 0) {

    listOfFunctions.push(x);
  }
}

The listOfFunctions array will contain the names of all the global functions which are not native.

---

UPDATE: As @CMS pointed out in the comments below, the above won't work in Internet Explorer 8 and earlier for global function declarations.