JavaScript program to find the occurrences of a character in a String

Following program shows you how to find the occurrences of a character in a string

function countString(str, letter) {
 let count = 0;
 
  // looping through the items
  for (let i = 0; i < str.length; i++) 
  {
    // check if the character is at that position
    if (str.charAt(i) == letter) 
    {
      count += 1;
    }
  }
    return count;
}

// take input from the user
const string = 'this is a string';
const letterToCheck = 'i';

//passing parameters and calling the function
const result = countString(string, letterToCheck);

// displaying the result
console.log(result); 

Output:

3 

Try it Online here: https://onecompiler.com/javascript/3x6vym8gr