Bean counting

/* 
  My answer for exercise 'Bean counting'
  in Eloquent JavaScript Second Edition
  Chapter 3 Functions 
*/


function countBs(string) {
  var str = string.toLowerCase();
  var array = str.split("");
  var arrayLength = array.length;
  var num = 0;
  for(var i = 0; i < arrayLength; i++) {
    if(array[i] == "b") {
      num ++;
    }
  }
  return num
}
/*
  I copied everthing I did above, and 
  changed the "b" to "letter" instead, 
  which is passed as the argument

*/

function countChar(string,letter) {
  var str = string.toLowerCase();
  var array = str.split("");
  var arrayLength = array.length;
  var num = 0;
  for(var i = 0; i < arrayLength; i++) {
    if(array[i] == letter) {
      num ++;
    }
  }
  return num

  
}