possibleStringCount.js

/**
Alice is attempting to type a specific string on her computer. However, she tends to be clumsy and may press a key for too long, resulting in a character being typed multiple times.

Although Alice tried to focus on her typing, she is aware that she may still have done this at most once.

You are given a string word, which represents the final output displayed on Alice's screen.

Return the total number of possible original strings that Alice might have intended to type.

Example 1:
Input: word = "abbcccc"
Output: 5

Explanation:
The possible strings are: "abbcccc", "abbccc", "abbcc", "abbc", and "abcccc".

Example 2:
Input: word = "abcd"
Output: 1

Explanation:
The only possible string is "abcd".

Example 3:
Input: word = "aaaa"
Output: 4

Constraints:
1 <= word.length <= 100
word consists only of lowercase English letters.

* @param {string} word
* @return {number}
*/
var possibleStringCount = function (word) {
  let count = 1;
  let charOccurence = 1;

  for (let i = 0; i < word.length; i++) {
    if (word[i] == word[i + 1]) {
      charOccurence++;
    } else {
      if (charOccurence > 1) {
        count += charOccurence - 1;
      }
      charOccurence = 1;
    }
  }
  return count;
};