What's the Difference Between `{a: a, b: b, c: c}` and `{a, b, c}` in JavaScript Object Literals?

Object Literals in JavaScript: Unveiling the Enigma of {a, b, c}

Imagine the following code:

var d = {a: a, b: b, c: c}; // object literal
var e = [a, b, c];          // array
var f = {a, b, c};          // what exactly is this??

A question arises: what kind of data structure is f? Is it a mere shortcut for d, or something more?

To resolve this enigma, let's explore the concept of Object Literal Property Value Shorthands. Introduced in ES6, this syntax offers a concise way to construct object literals:

var f = {a, b, c};

This is equivalent to:

var f = {a: a, b: b, c: c};

In other words, f is an object literal that initializes its properties with the values of the existing variables a, b, and c.

Additionally, shorthands can be combined with classical property initialization:

var f = {a: 1, b, c};

For a comprehensive understanding, refer to the documentation on Property definitions in Object initializer.

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