Practice: Exploring Objects Using JavaScript

You accessed the object's properties and methods using dot notation. The object name (person) acts as the namespace – it must be entered first to access anything encapsulated inside the object. Next you write a dot, then the item you want to access – this can be the name of a simple property, an item of an array property, or a call to one of the object's methods, for example:

person.age
person.interests[1]
person.bio()

Sub-namespaces

It is even possible to make the value of an object member another object. For example, try changing the name member from

name: ['Bob', 'Smith'],

to

name : {
  first: 'Bob',
  last: 'Smith'
},

Here we are effectively creating a sub-namespace. This sounds complex, but really it's not – to access these items you just need to chain the extra step onto the end with another dot. Try these in the JS console:

person.name.first
person.name.last

Important: At this point you'll also need to go through your method code and change any instances of

name[0]
name[1]

to

name.first
name.last

Otherwise your methods will no longer work.