Find the Factorial of a Given Number in JavaScript | Learn JavaScript & Algorithms

How to find the factorial of a given number in JavaScript? First of all, what is factorial? The factorial of a given number is the product of all positive integers less than or equal to that number. For example, factorial of 5 is 120. We have to write a function that finds the factorial of a given number using recursion.

To find the factorial of a given number in JavaScript, create a function that takes in a single parameter, the number for which you want to find the factorial. Initialize a variable to store the factorial and set it to 1. If input is less than 0 or negative number, return empty result or show message or something. Factorial can not be a negative number or 0. No negative, no zero.

Use a for loop to iterate from the given number down to 1. For each number in the loop, multiply the factorial by the current number. Return the factorial after the loop. Call the function with the number and you will get the factorial. One thing to note that factorial can not be 0 and it can not be negative.

Okay this is how we can find the factorial of a given number in JavaScript. You can also use the for loop to iterate from 1 to the given number, instead of from given number down to 1. it is also fine.

So this is how you can find factorial of a given number.

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