How to Swap Two Values Without Temporary Variable in Javascript

In this article, you will learn how to swap two values without a temporary variable in Javascript.

Let’s say you have 2 variables.

// A number variable called 'a' with value 123
var a = 123;

// A number variable called 'b' with value 456
var b = 456;

In order to swap two values without a temporary variable, you can use the ES6’s destructuring assignment. In this example, you will be swapping the values of variable ‘a’ with value of variable ‘b’.

// A number variable called 'a' with value 123
var a = 123;

// A number variable called 'b' with value 456
var b = 456;

// Value of variable 'b' is assigned to variable 'a' and vice versa
[a, b] = [b, a];

console.log(a);
// => 456

console.log(b);
// => 123

Note: The ES6’s destructuring assignment functions by extracting values from its right operand and assigning them to its left operand.