4.3 Enhanced Object Literals

Object literals are extended to

• support setting the prototype at construction,

  var obj = {
    // Sets the prototype.
    __proto__: theProtoObj
  }
  

• shorthand for foo: foo assignments,

  var obj = {
    // Shorthand for ‘handler: handler’
    handler,
  }
  

• defining methods and

  var obj = {
    // Methods
    toString() {
      ...
    },
  }
  

• making super calls.

  var obj = {
    // Super calls
    method() {
      super()
      ...
    }
  }
  

• computed property namnes

  var obj = {
    // // Computed (dynamic) property names
    [ "prop_" + (() => 42)() ]: 42
  }