About JavaScript Logical Assignments

Introduction

In this article, we are going to explore JavaScript logical assignment operators which were introduced in ES2021. and also at the end of this article, I am going to share information about the App which is going to help us for staying up-to-date with the latest coding and programming-related news.

ES2021 Introduces the 3 useful JavaScript logical assignment operators including:

1. Logical OR assignment operator ( ||= )

2. Logical AND assignment operator ( &&= )

3. Nullish coalescing assignment operator ( ??= )

The logical OR assignment operator ( ||= )

The logical OR assignment operator will accept the two operands and assigns the right-side operand to the left side only if the left-side operand is falsy.

Syntax:

a ||= b

In this syntax ||= operator only assigns the value of b to the a, if a is falsy.

For example:

let name;
name ||= '<ANONYMOUS>';
console.log(name); // Expected Output:- <ANONYMOUS>

Explanation

In this example, the variable name is undefined and as we know that undefined is a falsy value. since the variable name is undefined the operator ||=
assigns the '<ANONYMOUS>' to the name variable. and the output will be '<ANONYMOUS>' as expected.

Example 2:

const name = 'John Doe';
name ||= '<ANONYMOUS>';
console.log(name) // Expected output:- John Doe

Explanation

Now, in this example variable name is a 'John Doe'. so it's truthy, therefore logical OR assignment operator does not assign the string '<ANONYMOUS>' to the name.

The logical AND assignment operator ( &&= )

The logical AND assignment operator assigns the right side operand to the left side operand only if the value of the left side is truthy.

Syntax:

a &&= b

In this syntax &&= operator assigns the value of b to the a, only if the value of a is truthy.

For Example:

const userInfo = {
  firstName: "Tony",
  lastName: "Stark",
};

userInfo.lastName &&= "Shark";
console.log(userInfo); 
// output:- { firstName: 'Tony', lastName: 'Shark' }

Explanation

In this example, the &&= operator is used to change the last name of the userInfo object as the last name is truthy.

The nullish coalescing operator ( ??= )

The nullish coalescing operator is also known as the logical nullish assignment operator. Will assign the right side operand to the left side operand only if the left side operand is null or undefined.

syntax:

a ??= b

In this syntax the ??= operator assigns the value of b to the a, only if the value of a is null or undefined.

For Example:

const user = {
  userName: "Jane",
};
user.nickName ??= "anonymous";

console.log(user); 
// Output: { userName: 'Jane', nickName: 'anonymous' }

Explanation

In this example user.nickname is undefined, therefore it's nullish. Therefore ??= operator assigns the string 'anonymous' to the user.nickName property.

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