How to calculate the factorial of a number in JavaScript

In this Article we will go through how to calculate the factorial of a number only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const factorial = n => n <= 1 ? 1 : n * factorial(n - 1);

factorial(2);   // 2
factorial(3);   // 6
factorial(4);   // 24
factorial(5);   // 120
factorial(6);   // 720