是否可以使用CoffeeScript遍历类的静态变量和方法？

Question

Using CoffeeScript, I would like to be able to iterate over the static methods and variables of a class. More specifically, I'd like to gain access to all of the functions in Math .

I'm looking for functionality similar to:

for x in Math
    console.log (x + ": " + Math[x])

Is this possible?

Answer 1

来自上一个stackoverflow问题： 如何列出Math对象的所有属性？

Object.getOwnPropertyNames( Math )

Answer 2

Yes but what you need to do is iterate over the Object's prototype. In CoffeeScript it would look like this:

for key, value of MyClass.prototype
  console.log key, ':', value

EDIT:

In JavaScript it would be this:

var i;
for (i in MyClass.prototype) {
  // This condition makes sure you only test real members of the object.
  if (Object.prototype.hasOwnProperty.call(MyClass.prototype, i)) {
    console.log(i, ':', MyClass.prototype[i]);
  }
}

EDIT 2:

One caveat: this will not work with native JavaScript constructors so Math is a bad example. If you are using custom class constructors, it will work fine.