List all built-in functions in javascript?

Question

Is there a way in js to list all the builtin functions and some info on their parameterlists? I couldn't really find anything about reflection to do this sort of thing

edit: The functions such as Math.sin are actually the ones I want to list, actually all built-in functions.

Barton

What is the point of doing this? How would you use the list? – Patronize

Why / Where you want this ? Please explain something more – Sumter

What do you mean by built-in functions? Functions defined in the specification for the global object? Methods of built-in objects (defined by the specification)? Functions of host objects common to browsers? Functions of the DOM? – Cahoot

Built-in where? In the browsers? In the language? – Chenoweth

Just open the browsers inspector tool and start browsing the hierarchy of objects/methods – Interlace

They are for use in a lisp project. And all functions is as they are specified in the standard, global object, object object, function object etc. – Barton

Answer 1

Something like this, maybe?

for( var x in window) {
    if( window[x] instanceof Function) console.log(x);
}

This will list all native functions in the console (excluding one in native objects, such as Math.sin()).

Louella

Thank you, this brings me a little closer, I've changed it to this: for(var x in window) { if(typeof eval('window.' + x) == 'function') { console.log(eval('window.' + x)); } } However, functions such as Math.sin etc are exactly the ones I want to list – Barton

@Frawr: Any reason you use eval? Why not typeof window[x] === 'function' and console.log(window[x])? – Cahoot

This does not list XMLHttpRequest. Is there a way to get this also? – Arnold

@Arnold Not really. A lot of things will be made non-Enumerable, so they won't show up in a loop like this. This might even be done on purpose with all native stuff, so that a for..in could be "useful" as in "iterate through all user-defined global variables" - ideally, this would be empty. – Louella

Is there a nodejs version of this little script? – Diffractometer

Answer 2

Just do console.log(window). Now open your browser and go to console. You will find all the built-in functions of the Javascript like Math.sin and XMLHttpReuest. It will show the complete information about arguments, length, caller and everything about that function.

Auberta

Answer 3

Another good way to list all functions (and objects) is:

console.log(globalThis)

globalThis unites window, self and frames objects.

Algid