How to Rename Target Variables in ES6 Object Destructuring?

Renaming Target Variables in ES6 Object Destructuring

Object destructuring is a powerful feature introduced in ES6 that allows developers to extract specific properties from an object into individual variables. However, by default, the names of the extracted properties are the same as the original variable names. This limitation can be inconvenient when we want to give different names to the extracted variables.

Consider the following example:

<code class="js">const b = 6;
const test = { a: 1, b: 2 };
const {a, b as c} = test; // <-- `as` does not seem to be valid in ES6/ES2015
// a === 1
// b === 6
// c === 2</code>

In this example, we try to destructure the test object and assign new names (a and c) to the a and b properties, respectively. However, using the as keyword (as shown in the commented line) is not valid in ES6.

To resolve this issue and rename target variables during object destructuring, we can use the following syntax:

<code class="js">const {a: foo, b: bar} = test;</code>

This syntax assigns the a property of the test object to a new variable named foo and the b property to a new variable named bar.

Let's demonstrate with an example:

<code class="js">const test = { a: 42, b: true };

const {a: foo, b: bar} = test;

console.log(foo); // 42
console.log(bar); // true</code>

In this example, we destructure the test object and assign the a property to foo and the b property to bar. The foo and bar variables are then used to access the original values from the test object.

This renaming technique provides greater flexibility when working with object destructuring, allowing developers to create meaningful variable names that align with the intended purpose or context of the code.

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