Write a JavaScript program to swap two variables

Description: Swap the values of two variables a and b.

Hint:

• The old way uses a third variable.
• The modern way uses array destructuring.

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JavaScript program to swap two variables

let a = 10;
let b = 20;
console.log("Before:", a, b);

[a, b] = [b, a];

console.log("After:", a, b);

Output:

How it works

• The right side [b, a] makes a new array with the two values.
• The left side [a, b] destructures it back into the variables, so they are swapped in one line.

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