JavaScript: Find the number of times to replace a given number with the sum of its digits until it convert to a single digit number
JavaScript Basic: Exercise-105 with Solution
Write a JavaScript program to find the number of times to replace a given number with the sum of its digits until it convert to a single digit number.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Find the number of times to replace a given number with the sum of its digits until it convert to a single digit number</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function digit_to_one(num) {
var digitSum = function(num) {
var digit_sum = 0;
while (num) {
digit_sum += num % 10;
num = Math.floor(num / 10);
}
return digit_sum;
};
var result = 0;
while (num >= 10) {
result += 1;
num = digitSum(num);
}
return result;
}
console.log(digit_to_one(123))
console.log(digit_to_one(156))
Sample Output:
1 2
Flowchart:
ES6 Version:
function digit_to_one(num) {
const digitSum = num => {
let digit_sum = 0;
while (num) {
digit_sum += num % 10;
num = Math.floor(num / 10);
}
return digit_sum;
};
let result = 0;
while (num >= 10) {
result += 1;
num = digitSum(num);
}
return result;
}
console.log(digit_to_one(123))
console.log(digit_to_one(156))
Live Demo:
See the Pen javascript-basic-exercise-105 by w3resource (@w3resource) on CodePen.
Contribute your code and comments through Disqus.
Previous: Write a JavaScript program to find two elements of the array such that their absolute difference is not greater than a given integer but is as close to the said integer.
Next: Write a JavaScript program to divide an integer by another integer as long as the result is an integer and return the result.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework