How do I enumerate the properties of a JavaScript object? [duplicate]

Answer 1

If you're trying to enumerate the properties in order to write new code against the object, I would recommend using a debugger like Firebug to see them visually.

Another handy technique is to use Prototype's Object.toJSON() to serialize the object to JSON, which will show you both property names and values.

var data = {name: 'Violet', occupation: 'character', age: 25, pets: ['frog', 'rabbit']};
Object.toJSON(data);
//-> '{"name": "Violet", "occupation": "character", "age": 25, "pets": ["frog","rabbit"]}'

http://www.prototypejs.org/api/object/tojson

Answer 2

If you are using the Underscore.js library, you can use function keys:

_.keys({one : 1, two : 2, three : 3});
=> ["one", "two", "three"]