Map

When objects are added to a can.List, those objects are converted into can.Map instances. For example:

var list = new can.List();
list.push({name: "Justin"});

var map = list.attr(0);
map.attr("name") //-> "Justin"

By changing can.List.Map, you can specify a different type of Map instance to create. For example:

var User = can.Map.extend({
  fullName: function(){
    return this.attr("first")+" "+this.attr("last")
  }
});

User.List = can.List.extend({
  Map: User
}, {});

var list = new User.List();
list.push({first: "Justin", last: "Meyer"});

var user = list.attr(0);
user.fullName() //-> "Justin Meyer"