hitung huruf

/* buat function dengan dua parameter a dan b. hitung berapa karakter a yg ada dalam kalimat b */
// youtube
function str(a, b) {
    return b.split(a).length -1;
}
console.log(str('a', 'how many times the character occur on this sentence?'));
console.log(str('e', 'how many times the character occur on this sentence?'));
console.log(str('o', 'how many times the character occur on this sentence?'));
console.log(str('t', 'how many times the character occur on this sentence?'));
console.log(str('a', 'how many times the character occur on this sentence?'));
console.log(str('a', 'how many times the character occur on this sentence?'));
console.log(str('a', 'how many times the character occur on this sentence?'));