DoneJS StealJS jQuery++ FuncUnit DocumentJS
6.0.1
5.33.2 4.3.0 3.14.1 2.3.35
  • About
  • Guides
  • API Docs
  • Community
  • Contributing
  • Bitovi
    • Bitovi.com
    • Blog
    • Design
    • Development
    • Training
    • Open Source
    • About
    • Contact Us
  • About
  • Guides
  • API Docs
    • Observables
      • can-bind
      • can-compute
      • can-debug
      • can-deep-observable
      • can-define
      • can-define/list/list
      • can-define/map/map
      • can-define-backup
      • can-define-stream
      • can-define-stream-kefir
      • can-event-queue
      • can-kefir
      • can-list
      • can-map
      • can-map-compat
      • can-map-define
      • can-observable-array
      • can-observable-object
        • behaviors
          • async
          • default
          • enumerable
          • get
          • get default()
          • identity
          • required
          • serialize
          • set
          • type
          • value
        • static
          • propertyDefaults
          • props
          • seal
        • prototype
          • get property()
          • set property()
        • types
          • DefinitionObject
          • Property
      • can-observation
      • can-observation-recorder
      • can-observe
      • can-simple-map
      • can-simple-observable
      • can-stream
      • can-stream-kefir
      • can-value
    • Views
      • can-attribute-observable
      • can-component
      • can-observable-bindings
      • can-stache
      • can-stache-bindings
      • can-stache-converters
      • can-stache-element
      • can-stache-route-helpers
      • can-view-autorender
      • can-view-callbacks
      • can-view-import
      • can-view-model
      • can-view-parser
      • can-view-scope
      • can-view-target
      • steal-stache
    • Data Modeling
      • can-connect
      • can-connect-feathers
      • can-connect-ndjson
      • can-connect-tag
      • can-define-realtime-rest-model
      • can-define-rest-model
      • can-fixture
      • can-fixture-socket
      • can-local-store
      • can-memory-store
      • can-ndjson-stream
      • can-query-logic
      • can-realtime-rest-model
      • can-rest-model
      • can-set-legacy
      • can-super-model
    • Routing
      • can-deparam
      • can-param
      • can-route
      • can-route-hash
      • can-route-mock
      • can-route-pushstate
    • JS Utilities
      • can-assign
      • can-define-lazy-value
      • can-diff
      • can-globals
      • can-join-uris
      • can-key
      • can-key-tree
      • can-make-map
      • can-parse-uri
      • can-queues
      • can-string
      • can-string-to-any
      • can-zone-storage
    • DOM Utilities
      • can-ajax
      • can-attribute-encoder
      • can-child-nodes
      • can-control
      • can-dom-data
      • can-dom-events
      • can-dom-mutate
      • can-event-dom-enter
      • can-event-dom-radiochange
      • can-fragment
    • Data Validation
      • can-define-validate-validatejs
      • can-type
      • can-validate
      • can-validate-interface
      • can-validate-legacy
      • can-validate-validatejs
    • Typed Data
      • can-cid
      • can-construct
      • can-construct-super
      • can-data-types
      • can-namespace
      • can-reflect
      • can-reflect-dependencies
      • can-reflect-promise
      • can-types
    • Polyfills
      • can-symbol
      • can-vdom
    • Core
    • Infrastructure
      • can-global
      • can-test-helpers
    • Ecosystem
    • Legacy
  • Community
  • Contributing
  • GitHub
  • Twitter
  • Chat
  • Forum
  • News
Bitovi

default

  • Edit on GitHub

Specifies the default value for instances of the defined type.

default

Provide primitive values to act as the initial value for the property if no value is provided upon instantiation. For example:

import { ObservableObject } from "can/everything"

class Example extends ObservableObject {
  static props = {
    prop: {
      default: "foo"
    }
  };
}

const ex = new Example();
console.log( ex.prop ); //-> "foo"

This could also be written using the Property shorthand method:

class Example extends ObservableObject {
  static props = {
    prop: "foo"
  };
}

Parameters

  1. defaultVal {*}:

    The default value, which will be passed through setter and type.

Use

The following defaults age to 0 and address to an object:

import { ObservableObject } from "can/everything";

class Person extends ObservableObject {
  static props = {
    // A default age of `0`:
    age: {
      default: 0
    }
  };
}

const person = new Person();
console.log( person.age ); //-> 0

Other ways to set the default

There is a second way to provide a default value, which is explained in get default() and is useful when defining an object as a default.

CanJS is part of DoneJS. Created and maintained by the core DoneJS team and Bitovi. Currently 6.0.1.

On this page

Get help

  • Chat with us
  • File an issue
  • Ask questions
  • Read latest news