Code Wars: Mumbling (using JS repeat method)

https://www.codewars.com/kata/mumbling/train/javascript


function accum(s) {
let count = 0;
  let storage = "";
 
  for (let letter of s) {

    storage += letter.toUpperCase() + letter.repeat(count) + "-";
    count++;
  }
 
  return storage.substring(0, storage.length - 1);
}

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