Get functions (methods) of a class [duplicate]

Question

I have to dynamically fetch the properties and functions of a ES6 class. Is this even possible?

Using a for...in loop, I only get to loop through the properties of a class instance:

class Foo {   constructor() {     this.bar = "hi";   }   someFunc() {     console.log(this.bar);   } } var foo = new Foo(); for (var idx in foo) {   console.log(idx); } 

Output:

bar 

Answer 1

The members of a class are not enumerable. To get them, you have to use Object.getOwnPropertyNames:

var propertyNames = Object.getOwnPropertyNames(Object.getPrototypeOf(foo)); // or var propertyNames = Object.getOwnPropertyNames(Foo.prototype); 

Of course this won't get inherited methods. There is no method that can give you all of them. You'd have to traverse the prototype chain and get the properties for each prototype individually.