bean-counting.js

// You can get the Nth character, or letter, from a string by writing "string"[N]. 
// The returned value will be a string containing only one character (for example, "b"). 
// The first character has position 0, which causes the last one to be found at position string.length - 1. 
// In other words, a two-character string has length 2, and its characters have positions 0 and 1.

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

// Next, 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.



function countBs(str) {
	let result = 0
	for(let i = 0; i < str.length; i++) {
  	if (str[i] === 'B') {
    	result += 1
    }
  }
  return result
}

// Another solution for countBs
// const countBs = str => countChar(str, 'B')

function countChar(str, char) {
	let result = 0
	for(let i = 0; i < str.length; i++) {
  	if (str[i] === char) {
    	result += 1
    }
  }
  return result
}


console.log(countBs("BBC"));
// → 2
console.log(countChar("kakkerlak", "k"));
// → 4