Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Armstrong number within a range in JavaScript
Armstrong Numbers: A positive integer is called an Armstrong number (of order n) if −
abcd... = a^n + b^n + c^n + d^n + ...
We are required to write a JavaScript function that takes in an array of exactly two numbers specifying a range.
The function should return an array of all the Armstrong numbers that falls in that range (including the start and end numbers if they are Armstrong).
We will first separately write a function to detect Armstrong numbers and then iterate through the range to fill the array with desired numbers.
Example
Following is the code −
const range = [11, 1111];
const isArmstrong = (num) => {
const numberOfDigits = ('' + num).length;
let sum = 0;
let temp = num;
while (temp > 0) {
let remainder = temp % 10;
sum += remainder ** numberOfDigits;
temp = parseInt(temp / 10);
}
return sum === num;
};
const findAllArmstrong = ([start, end]) => {
const res = [];
for(let i = start; i <= end; i++){
if(isArmstrong(i)){
res.push(i);
};
};
return res;
};
console.log(findAllArmstrong(range));Output
Following is the console output −
[ 153, 370, 371, 407 ]
Updated on: 20-Jan-2021
275 Views
Advertisements