Question

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List of global user defined functions in JavaScript?

I have a java script file (.js) which contains some functions:

function func1(arg)
{
}

function func2(arg)
{
}

...

I want to enumerate all functions defined in js file.
Is there a root object in javascript to enum all sub objects by it? (by methods defined in this post)

Ugly solutions:

One approach is to define an array like:
var functions = [func1, func2, …];

Another approach is string processing (such as regular expressions):

/function.+(.+)/

I there better solution for it?
thanks.

Answer 1

JavaScript has a root object, just open a console and type this, or window for that matter. If you want to list all functions in the global object, just treat the global object as you would any object:

for (var property in this)
{
    if (this.hasOwnProperty(property) && typeof this[property] === 'function')
    {
        console.log(property + ' is a function');
    }
}

You could leave out the .hasOwnProperty check, but remember that all objects, including window can be traced back to the Object.prototype, so you might end up enumerating prototype-methods, too. What’s more, the global object has its own prototype, too: Window.prototype.
A word of warning: when it comes to X-browser issues, the global object is one of the worst objects to deal with. IE, Mozilla, Chrome, Opera and Safari all have differences between them, some more then others.