JavaScript Program to Check Whether a Number is Armstrong Number or Not

Write a JavaScript program to input a number from user and check whether given number is Armstrong number or not. How to check Armstrong numbers in JavaScript program. Logic to check Armstrong numbers in JavaScript programming.

Example

Input number: 371

Output
371 is armstrong number

What is Armstrong number?
An Armstrong number is a n-digit number that is equal to the sum of the nth power of its digits. For example -
6 = 61 = 6
371 = 33 + 73 + 13 = 371

Required knowledge
Basic JavaScript programming, If else, While loop

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