Split a String in Balanced Strings.js

// Runtime: 77 ms (Top 74.11%) | Memory: 41.7 MB (Top 91.56%)
var balancedStringSplit = function(s) {
    let r_count = 0;
    let l_count = 0;
    let ans =0;
    for(let i = 0 ; i < s.length;i++){
        if(s[i]==='R') r_count++;
        else l_count++;

        if(l_count==r_count) {
         l_count=0
        r_count=0;
            ans++
        }

    }
    return ans
};