Write a function that takes a string as its argument and count assign char

countChar.js

 
/*Write a function countBs that takes a string as its only argument and returns a number that 
  indicates how many uppercase “B” characters are in the string.

Second, write a function called countChar that behaves like countBs, except it takes a second argument that
indicates the character that is to be counted (rather than counting only uppercase "B" characters). Rewrite countBs to make use of this new function.*/

var countBs, countChar;
countBs = function(str) {
  return countChar(str, "B");
};
countChar = function(str, chr) {
  var counter, i, r;
  counter = 0;
  for (i = 0, r = str.length; 0 <= r ? i < r : i > r; 0 <= r ? i++ : i--) {
    if (str.charAt(i) === chr) {
      counter++;
    }
  }
  return counter;
};

console.log(countBs("BiBBleBiBBleDuBBle"));
// → 8
console.log(countChar("BiBBleBiBBleDuBBle", "l"));
// → 3