*for Directive
Iterating across an object, array, set, map, or any other iterable is handled through the *for directive. This also automatically updates when the property on your controller is assigned to a new value. The key and value will be available in the expression as key and value.
You can rename key and value to suit your needs. Also, nested scopes inherit from each other, exactly how you think they should. Scopes are discussed more on the Expressions page.
Common Errors
Make sure to use of. If you use in, it will not work and instead you would be iterating over a boolean value, which is not iterable.