## Example 1: Using a Temporary Variable

```
//JavaScript program to swap two variables
//take input from the users
let a = prompt('Enter the first variable: ');
let b = prompt('Enter the second variable: ');
//create a temporary variable
let temp;
//swap variables
temp = a;
a = b;
b = temp;
console.log(`The value of a after swapping: ${a}`);
console.log(`The value of b after swapping: ${b}`);
```

**Output**

Enter the first variable: 4 Enter the second variable: 2 The value of a after swapping: 2 The value of b after swapping: 4

Here,

- We created a
`temp`variable to store the value of`a`temporarily. - We assigned the value of
`b`to`a`. - The value of
`temp`is assigned to`b`

As a result, the value of the variables are swapped.

**Note:** You can also swap strings or other data types using this method.

## Example 2: Using es6(ES2015) Destructuring assignment

```
//JavaScript program to swap two variables
//take input from the users
let a = prompt('Enter the first variable: ');
let b = prompt('Enter the second variable: ');
//using destructuring assignment
[a, b] = [b, a];
console.log(`The value of a after swapping: ${a}`);
console.log(`The value of b after swapping: ${b}`);
```

**Output**

Enter the first variable: 4 Enter the second variable: 2 The value of a after swapping: 2 The value of b after swapping: 4

Here, a new es6 feature, called destructuring assignment `[a, b] = [b, a]`

, is used to swap the value of two variables. If `[a, b] = [1, 2, 3]`

, the value of `a` will be **1** and value of `b` will be **2**.

- First a temporary array
`[b, a]`is created. Here the value of`[b, a]`will be`[2, 4]`

. - The destructuring of the array is done, i.e
`[a, b] = [2, 4]`

.

As a result, the value of the variables are swapped.

You can learn more about **destructuring** in JavaScript Destructing Assignment.

**Note**: You can also swap strings or other data types using this method.

You can also swap the variable's values using the **arithmetic** operators.

## Example 3: Using Arithmetic Operators

```
//JavaScript program to swap two variables
//take input from the users
let a = parseInt(prompt('Enter the first variable: '));
let b = parseInt(prompt('Enter the second variable: '));
// addition and subtraction operator
a = a + b;
b = a - b;
a = a - b;
console.log(`The value of a after swapping: ${a}`);
console.log(`The value of b after swapping: ${b}`);
```

**Output**

Enter the first variable: 4 Enter the second variable: 2 The value of a after swapping: 2 The value of b after swapping: 4

This method only uses the two variables and swaps the value of the variables using arithmetic operators `+`

and `-`

.

Here, parseInt() is used because `prompt()`

takes input from the user as a string. And when numeric strings are added, it behaves as a string. For example, `'2' + '3' = '23'`

. So `parseInt()`

converts a numeric string to number.

To learn more about the type conversion, go to JavaScript Type Conversions.

Let's see how the above program swaps values. Initially, `a` is **4** and `b` is **2**.

`a = a + b`

assigns the value`4 + 2`

to`a`(now**6**).`b = a - b`

assigns the value`6 - 2`

to`b`(now**4**).`a = a - b`

assign the value`6 - 4`

to`a`(now**2).**

Finally, `a` is **2** and `b` is **4**.

**Note**: You can use arithmetic operators (`+`

, `-`

) if both variables are of number type.

## Example 4: Using Bitwise XOR operator

```
//JavaScript program to swap two variables
//take input from the users
let a = prompt('Enter the first variable: ');
let b = prompt('Enter the second variable: ');
// XOR operator
a = a ^ b
b = a ^ b
a = a ^ b
console.log(`The value of a after swapping: ${a}`);
console.log(`The value of b after swapping: ${b}`);
```

**Output**

Bitwise XOR operator evaluates to `true`

if both operands are different. To learn more about bitwise operators, visit JavaScript Bitwise Operators.

Let's see how the above program swaps values. Initially, `a` is **4** and `b` is **2**.

`a = a ^ b`

assigns the value`4 ^ 2`

to`a`(now**6**).`b = a ^ b`

assigns the value`6 ^ 2`

to`b`(now**4**).`a = a ^ b`

assign the value`6 ^ 4`

to`a`(now**2).**

Finally, `a` is **2** and `b` is **4**.

**Note**: You can use this method for only integer (whole number) values.