get default()

A getter that returns the default value used for this property, like:

import { ObservableObject } from "can/everything";

class Example extends ObservableObject {
  static props = {
    prop: {
      get default() {
        return [];
      }
    }
  };
}

const ex = new Example();
console.log( ex.prop ); //-> []

If the default value should be an object of some type, it should be specified as the return value of a getter function (the above call signature) so that all instances of this map don't point to the same object. For example, if the property value above had not returned an empty array but instead just specified an array using default, all instances of that map would point to the same array (because JavaScript passes objects by reference).

import { ObservableObject } from "can/everything";

class Person extends ObservableObject {
  static props = {
    age: {
      default: 0
    },
    address: {
      get default() {
        return { city: "Chicago", state: "IL" };
      }
    }
  };
}

const person = new Person();
console.log( person.age ); //-> 0
console.log( person.address ); //-> { city: "Chicago", state: "IL" }