Object Literal Enhancements

Champions: Allen Wirfs-Brock, ?
ES Wiki

Property Value Shorthand

Provide a shorthand for object initialisers whose property keys are initialized by variables of the same name.

The example:

function f( x, y ) {
  return { x: x, y: y };
}

Would be written as:

function f( x, y ) {
  return { x, y };
}

Method Definition Shorthand

The example:

var o = {
  method: function() {
    return "Hello!";
  }
};

Would be written as:

var o = {
  method() {
    return "Hello!";
  }
};