Really thought I had this one, but only works for half of cases

JavaScript
1 
function mutation(arr) {
  arr[0] = arr[0].toLowerCase();
  arr[0] = arr[0].split(""); 
  arr[1] = arr[1].toLowerCase();
  arr[1] = arr[1].split(""); 
  console.log(arr[0]); 
  console.log(arr[1]); 
  for (let i=0; i<arr[1].lengtth; i++){
    if (!arr[0].includes(arr[1][i])){
      return false;
    }
  }
  return true;
}

mutation(["HELLO", "HEY"]);
2

It would work in all cases if you checked your spelling of the word “length” :wink:

3

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