Get javascript object property via key name in variable [duplicate]

Question

Say I have something that looks like this in javascripts:

var obj = {
  subObj : {}
};
var type = 'subObj';

How can I get obj's subObj w/ type? For instance I would like to do something like:

obj.(type);

Answer 1

obj[type]

You use subscript notation.

11.2.1 Property Accessors

Properties are accessed by name, using either the dot notation:

MemberExpression . IdentifierName
CallExpression . IdentifierName

or the bracket notation:

MemberExpression [ Expression ]
CallExpression [ Expression ]

Answer 2

You can treat objects like associative arrays in JavaScript, so you'll be able to access the inner object like:

var obj = {
    subObj : {}
};

var type = "subObj";
var subObj = obj[type];