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.

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()).