Remove First Update Age Copy
Reset List
track by $id(friend) (default):

• {{friend.name}} is {{friend.age}} years old.

track by $id(friend) (default), with age one-time binding:

• {{friend.name}} is {{::friend.age}} years old.

track by friend.name, with age one-time binding:

• {{friend.name}} is {{::friend.age}} years old.

track by $index, with age one-time binding:

• {{friend.name}} is {{::friend.age}} years old.