JavaScript Exercises

JavaScript: Letter count within a string

JavaScript Function: Exercise-22 with Solution

Write a JavaScript function that accepts two arguments, a string and a letter and the function will count the number of occurrences of the specified letter within the string.

Sample arguments: 'w3resource.com', 'o'
Expected output: 2

Pictorial Presentation:

JavaScript: Letter count within a string

Sample Solution: -

HTML Code:

<!DOCTYPE html>
  <meta charset="utf-8">
  <title>Letter count within a string</title>


JavaScript Code:

function char_count(str, letter) 
 var letter_Count = 0;
 for (var position = 0; position < str.length; position++) 
    if (str.charAt(position) == letter) 
      letter_Count += 1;
  return letter_Count;

console.log(char_count('w3resource.com', 'o'));

Sample Output:



Flowchart: JavaScript function: Letter count within a string

Live Demo:

See the Pen JavaScript - Letter count within a string-function-ex- 22 by w3resource (@w3resource) on CodePen.

Contribute your code and comments through Disqus.

Previous: Write a JavaScript function to get all possible subset with a fixed length (for example 2) combinations in an array.
Next: Write a JavaScript function to find the first not repeated character.

What is the difficulty level of this exercise?