#744 - Find Smallest Letter Greater Than Target

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Problem Description

You are given an array of characters letters that is sorted in non-decreasing order, and a character target. There are at least two different characters in letters.

Return the smallest character in letters that is lexicographically greater than target.

If such a character does not exist, return the first character in letters.

Solution

/**
 * @param {character[]} letters
 * @param {character} target
 * @return {character}
 */
var nextGreatestLetter = function(letters, target) {
  return letters.find(l => l > target) || letters[0];
};