How do you iterate over all methods in a JavaScript pseudoclass, regardless of whether or not they are marked enumerable?

Question

I'm trying to iterate over all methods in a JavaScript pseudoclass and can easily tell if something is a method or not with (obj.member instanceof Function), however I'm trying to include methods that may be hidden from a for...in loop via defineProperty with an enumerable flag set to false - how do I iterate all members of a pseudoclass, regardless of the enumerable value?

Nuptials

Answer 1

You can always use Object.getOwnPropertyNames, which will include non-enumerable properties as well. However, this will not include properties from prototypes, so if you are asking about "pseudoclass instances" you might need to loop the prototype chain with Object.getPrototypeOf.

Apiary

Correction, in 8 minutes you can have some karma - damned site think's I'm a bot or something. – Nuptials

what if, in inspection, I can see a property but it doesn't apear under getOwnPropertyNames nor keys? Example: typeof obj['stuff'] == 'function'; Object.getOwnPropertyNames(this).indexOf('stuff') == -1. This happened on an ES6 class, babelified. – Caulicle

@igorsantos07: as the answer says, it's likely an inherited property. Try Object.getOwnPropertyNames(Object.getPrototypeOf(this)), or use a complete loop. – Apiary

whoa. that's confusing. it seems from the object instance I need to use getPrototypeOf to get to the actual defined class. might be some sort of effect from using Babel to transpile code :| – Caulicle

@igorsantos07: No, that's how prototypes worked since the beginning, even without ES6 or Babel. – Apiary

so getOwnPropertyNames won't include properties from prototypes nor properties defined by its own class, right? – Caulicle

@Caulicle I'm not sure what you mean by "its own class". Every instance inherits the shared class methods from the prototype object. Only instance-specific data is stored in own properties. – Apiary

Let us continue this discussion in chat. – Caulicle

The following link might be relevant here. – Brabant