JavaScript: Calculate the factorial of a number

JavaScript Function: Exercise-1 with Solution

Write a JavaScript program to calculate the factorial of a number.

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120

Pictorial Presentation:

JavaScript: Calculate the factorial of a number

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Calculate the factorial of a number.</title>

JavaScript Code:

function factorial(x) 

  if (x === 0)
    return 1;
  return x * factorial(x-1);




Flowchart: JavaScript recursion function- Calculate the factorial of a number

Live Demo:

See the Pen javascript-recursion-function-exercise-1 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript program to find the greatest common divisor (gcd) of two positive numbers.

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JavaScript: Tips of the Day

valid Email

const createMember = ({ email, address = {}}) => {
	const validEmail = /.+\@.+\..+/.test(email)
	if (!validEmail) throw new Error("Valid email pls")

	return {
		address: address ? address : null

const member = createMember({ email: "[email protected]" })

The default value of address is an empty object {}. When we set the variable member equal to the object returned by the createMember function, we didn't pass a value for address, which means that the value of address is the default empty object {}. An empty object is a truthy value, which means that the condition of the address ? address : null conditional returns true. The value of address is the empty object {}.

Ref: https://bit.ly/2IUFeTa