1221. Split a String in Balanced Strings

Balanced strings are those who have equal quantity of 'L' and 'R' characters.
Given a balanced string s split it in the maximum amount of balanced strings.
Return the maximum amount of splitted balanced strings.

• Example 1:
  Input: s = "RLRRLLRLRL"
  Output: 4
  Explanation: s can be split into "RL", "RRLL", "RL", "RL", each substring contains same number of 'L' and 'R'.

• Example 2:
  Input: s = "RLLLLRRRLR"
  Output: 3
  Explanation: s can be split into "RL", "LLLRRR", "LR", each substring contains same number of 'L' and 'R'.

• Example 3:
  Input: s = "LLLLRRRR"
  Output: 1
  Explanation: s can be split into "LLLLRRRR".

• Example 4:
  Input: s = "RLRRRLLRLL"
  Output: 2
  Explanation: s can be split into "RL", "RRRLLRLL", since each substring contains an equal number of 'L' and 'R'

var balancedStringSplit = function(s) {
    var count = 0, num = 0;
    s.split('').forEach((i, idx) => {
        if(i === 'R') num++
        else num--
        if(num === 0) count++
    });
    return count
};