javascript counting characters in a string code example

Example 1: how to check how many strings are in a sentence javascript

function WordCounter (str) {
	var words = str.split(" ").length;
	return words;
}
// this should work!

Example 2: count value a to b character javascript

let counter = str => {
  return str.split('').reduce((total, letter) => {
    total[letter] ? total[letter]++ : total[letter] = 1;
    return total;
  }, {});
};

counter("aabsssd"); // => { a: 2, b: 1, s: 3, d: 1 }