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.

What is the point of doing this? How would you use the list? — Pointy
– Pointy, Commented Jan 1, 2012 at 15:57
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? — Felix Kling
– Felix Kling, Commented Jan 1, 2012 at 16:00
Just open the browsers inspector tool and start browsing the hierarchy of objects/methods — Alex
– Alex, Commented Jan 1, 2012 at 16:11

Niet the Dark Absol · Accepted Answer · 2014-02-08 14:15:07Z

10

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()).

edited Feb 8, 2014 at 14:15

answered Jan 1, 2012 at 15:56

Niet the Dark Absol

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5 Comments

Ferdy Over a year ago

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

Felix Kling Over a year ago

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

heinob Over a year ago

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

Niet the Dark Absol Over a year ago

@heinob 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.

Lori Over a year ago

Is there a nodejs version of this little script?

Rajashekar Reddy · Accepted Answer · 2021-05-13 09:39:20Z

1

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.

answered May 13, 2021 at 9:39

Rajashekar Reddy

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Comments

ItzYurix · Accepted Answer · 2024-05-01 17:45:54Z

0

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

console.log(globalThis)

globalThis unites window, self and frames objects.

answered May 1, 2024 at 17:45

ItzYurix

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