JS function of representing array elements in ASCII

Question

function translateInWord(mas){
  mas = [].concat(...mas);
  for (let i = 0; i < mas.length; i++){
    mas[i] = String.fromCharCode(mas[i]);
  }
  return mas;
}
console.log(translateInWord([[6,8,13],[5,3,0]]));

I want the program to show me every letter in ASCII from the array 'mas` (that is, it should turn out ['G','I','N','F','D','A'])

Answer 1

You are using a 0-indexed representation of the alphabet (0 -> A, ..., 25 -> Z).

fromCharCode() is taking UTF-16 code units as parameters.

If you look at an UTF-16 table, the decimal representation of A is 65 and the following 25 code units are corresponding to the other capital letters of the alphabet up to Z.

So you just need to add 65 to mas[i] to get its corresponding letter :

function translateInWord(mas){
  mas = [].concat(...mas);
  for (let i = 0; i < mas.length; i++){
    mas[i] = String.fromCharCode(mas[i] + 65);
  }
  return mas;
}
console.log(translateInWord([[6,8,13],[5,3,0]]));