Removing Stars From a String

LeetCode題目: 2390. Removing Stars From a String

My solution:

/**
 * @param {string} s
 * @return {string}
 */
let removeStars = s => {
    let res = '', count = 0;
    for(let i=s.length-1; i>=0; i--) {
        s[i] === '*' 
            ?  count++
            :  count === 0 ? res = s[i] + res : count--;
    }
    return res;
};