You can get the Nth character, or letter, from a string by writing "string".charAt(N), similar to how you get its length with "s".length. The returned value will be a string containing only one character (for example, "b"). The first character has position zero, which causes the last one to be found at position string.length - 1. In other words,…

count_char.js

// Your code here.
function countBs(string){
	number_of_bs = 0;
    for (count = 0; count < string.length; count++){
    	if (string[count] == "B")
          number_of_bs += 1;
    }
  	return number_of_bs;
}

function countChar(string, char){
	number_of_char = 0;
    for (count = 0; count < string.length; count++){
    	if (string[count] == char)
          number_of_char += 1;
    }
  	return number_of_char;
}
console.log(countBs("BBC"));
// → 2
console.log(countChar("KKKKBCD", "K"));