Javascript: Type of properties/objects

Question

I have an object which has numerous properties in it. Now I want to access certain properties. For example, object is Car. Car has further properties which are actually objects, for example doors, wheels. Now there can be three, four or five or may be more doors in a car.

Now I want to get a list of object which are doors. Is it possible.

How do you define that an object is a door? Is it an instance of a javascript class? How have you defined this class? — Rogel Garcia, Jan 06 '12 at 02:15
Here is another example question: - http://stackoverflow.com/questions/208016/how-to-list-the-properties-of-a-javascript-object — Naveed, Jan 06 '12 at 02:16

score 1 · Answer 1 · answered Jan 06 '12 at 02:14

1

var doors = Object.keys(car).reduce(function (doors, name) {
  var potentialDoor = car[name];
  if (Door.isPrototypeOf(potentialDoor)) {
    doors.push(potentialDoor);
  }
  return doors;
}, []);

This makes a broad assumption that a car contains properties which are of "class" Door. And then returns an array of those properties.

answered Jan 06 '12 at 02:14

Raynos

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Worth noting IE8 makes me sad :( – Raynos Jan 06 '12 at 02:19
Hah, but just be happy we can stop noting that nothing works in IE6. – James Montagne Jan 06 '12 at 02:20
@JamesMontagne which part of the solution is a problem for IE8? – JaredPar Jan 06 '12 at 02:24
@JaredPar `Object.keys`, `Array#reduce` – Raynos Jan 06 '12 at 02:26
@JamesMontagne ah, that link is awesome. Thanks! – JaredPar Jan 06 '12 at 02:28

Javascript: Type of properties/objects

1 Answers1