Code Wars: Highest Scoring Word (passed on first try!)

https://www.codewars.com/kata/57eb8fcdf670e99d9b000272/train/javascript

Given a string of words, you need to find the highest scoring word.
Each letter of a word scores points according to it's position in the alphabet: a = 1, b = 2, c = 3 etc.
You need to return the highest scoring word as a string.
If two words score the same, return the word that appears earliest in the original string.
All letters will be lowercase and all inputs will be valid.


function high(x){
  let arr = x.split(" ");
  let largest;  //stores the current string with largest score
  let totalScore = 0;  //stores the current largest score for that particular string

  //create an array of lowercase alphabets
  let alphaArr = [];
  for (let i = 0; i < 26; i++) {
    alphaArr.push(String.fromCharCode(97 + i));
  }
  
  for (let i = arr.length - 1; i >= 0; i--) {  //loops through array
    let letterScore = 0;  //stores the total score for each string. Resets at each arr element.
    for (let j = 0; j < arr[i].length; j++) {  //loops through each letter of element
      letterScore += alphaArr.indexOf(arr[i].charAt(j)) + 1;
    }
    if (letterScore >= totalScore) {
      totalScore = letterScore;
      largest = arr[i];
    }
  }
  return largest;
}

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