Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

JavaScript: Compute the sum of all digits that occur in a given string

JavaScript Basic: Exercise-147 with Solution

Write a JavaScript program to compute the sum of all digits that occur in a given string.

Pictorial Presentation:

JavaScript: Compute the sum of all digits that occur in a given string.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Compute the sum of all digits that occur in a given string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function sum_digits_from_string(dstr) {
  var dsum = 0;

  for (var i = 0; i < dstr.length; i++)
  {

    if (/[0-9]/.test(dstr[i])) dsum += parseInt(dstr[i])
  }
  return dsum;
}

console.log(sum_digits_from_string("abcd12efg9"))
console.log(sum_digits_from_string("w3resource"))

Sample Output:

12
3

Flowchart:

Flowchart: JavaScript - Compute the sum of all digits that occur in a given string

ES6 Version:

function sum_digits_from_string(dstr) {
  let dsum = 0;

  for (let i = 0; i < dstr.length; i++)
  {

    if (/[0-9]/.test(dstr[i])) dsum += parseInt(dstr[i])
  }
  return dsum;
}

console.log(sum_digits_from_string("abcd12efg9"))
console.log(sum_digits_from_string("w3resource"))

Live Demo:

See the Pen javascript-basic-exercise-147 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to compute the sum of cubes of all integer from 1 to a given integer.
Next: Write a JavaScript program to swap two halves of a given array of integers of even length.

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