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
– Rogel Garcia, Commented Jan 6, 2012 at 2:15
Here is another example question: - stackoverflow.com/questions/208016/… — Naveed
– Naveed, Commented Jan 6, 2012 at 2:16

Raynos · Accepted Answer · 2012-01-06 02:14:09Z

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 6, 2012 at 2:14

Raynos

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4 Comments

Raynos Over a year ago

Worth noting IE8 makes me sad :(

James Montagne Over a year ago

Hah, but just be happy we can stop noting that nothing works in IE6.

JaredPar Over a year ago

@JamesMontagne which part of the solution is a problem for IE8?

Raynos Over a year ago

@JaredPar Object.keys, Array#reduce

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