const char = 'a';
const str = 'aaabbbccc';
let count = 0;
[...str].forEach((ele) => {
if (ele === char) {
count++;
}
});
console.log(count); // 3
const char = 'a';
const str = 'aaabbbccc';
const answer = [...str].reduce((acc, cur) => (cur === char ? acc + 1 : acc), 0);
console.log(answer); // 3
const char = 'a';
const str = 'aaabbbccc';
const regex = new RegExp(char, 'g');
console.log((str.match(regex) || []).length); // 3