Can ES6 object shorthand notation be combined with regular object notation?

Question

With ES6 we can now utilize object shorthand notation for creating objects...

var a = 1, b = 2, c = 3;
var obj = { a, b, c };

Is it possible to combine shorthand notation with regular notation?

In other words, is the following legit?

var obj = {a, b, c, d: 'foo'};

And if so, are there any gotchas I should be aware of?

Answer 1

Is it possible to combine shorthand notation with regular notation?

Yes. A property definition can be any of the following:

PropertyDefinition :
    IdentifierReference
    CoverInitializedName
    PropertyName : AssignmentExpression
    MethodDefinition

Source: ECMAScript 2015 Language Specification

And if so, are there any gotchas I should be aware of?

Nope.

Answer 2

According to Babel yes

See transpiled code results

Babel translates this

var a = 1, b = 2, c = 3;
var obj = {a, b, c, d: 'foo'};

into this in es5

var a = 1,
b = 2,
c = 3;

var obj = { a: a, b: b, c: c, d: 'foo' };

Also found a github repo by Luke Hoban that shows mixed objects being created