stream

stream( setterStream )

The stream behavior is an available property definition on the PropDefinition of all can-define types.

It is useful for deriving values that get can not, for example deriving values based around the change in another value intead of the values themselves.

var Person = DefineMap.extend({
  name: "string",
  lastValidName: {
    stream: function(){
      return this.stream(".name").filter(function(name){
        return name.indexOf(" ") >= 0;
      })
    }
  }
});

var me = new Person({name: "James"});

me.on("lastValidName", function(lastValid) {
  console.log(lastValid)
});

me.name = "JamesAtherton";

me.name = "James Atherton";
//-> console.logs "James Atherton";

me.name = "JustinMeyer";

me.name = "Justin Meyer";
//-> console.logs "Justin Meyer";

The property must be bound before a value can be read.