# JavaScript: Swap two variables

## JavaScript Math: Exercise-55 with Solution

Write a JavaScript program to swap variables from one to another.

Swapping two variables refers to mutually exchanging the values of the variables. Generally, this is done with the data in memory.

The simplest method to swap two variables is to use a third temporary variable :

define swap(x, y)

temp := x

x := y

y := temp

**Sample Solution:**

**JavaScript Code:**

```
// Declare and initialize two variables, x and y, with the values 20 and 40, respectively.
let x = 20;
let y = 40;
// Output the values of x and y.
console.log("x="+x+" y="+y)
// Declare a temporary variable and swap the values of x and y.
let temp;
temp = x;
x = y;
y = temp;
// Output the values of x and y after swapping.
console.log("After swapping:")
console.log("x="+x +" y="+y)
```

Output:

"x=" 20 "y=" 40 "After swapping:" "x=" 40 "y=" 20

**Flowchart: **

**Live Demo: **

See the Pen javascript-math-exercise-55 by w3resource (@w3resource) on CodePen.

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