Say I have an array such as this in Javascript:

var cars = { vendor: [ { type: [ 'camry', 'etc' ] } ] } 

In Javascript what command can I use to add an item to type... For example if I wanted to have a text box that a user can place text into and then hit a button that will add the item into the array. The item that would be added would need to be placed in with the same items as camry and etc. Thanks!