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'])

ASCII code for A is 65, not 0. Perhaps you mean the offset in the English alphabet rather than ASCII? — Álvaro González
– Álvaro González, Commented Dec 7, 2021 at 14:53
^ then 97 would also be the offset in the English alphabet, just lowercase. Better get away from ASCII at all and redefine this problem. The offsets relative to a specific const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; — Thomas
– Thomas, Commented Dec 7, 2021 at 14:59
@Thomas I didn't mean any computer encoding. The English alphabet only has 26 letters, with uppercase/lowercase not being considered different letters, so 97 would be off limits. ASCII has seemingly become a generic idiom for any numeric encoding of text. — Álvaro González
– Álvaro González, Commented Dec 8, 2021 at 12:19

Tom · Accepted Answer · 2021-12-07 15:04:32Z

2

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]]));

edited Dec 7, 2021 at 15:04

answered Dec 7, 2021 at 14:47

Tom

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2 Comments

xdumaine Over a year ago

You should include some explanation in answers, not just code.

Xeelley Over a year ago

Agreed with @xdumaine, what kind of offset is it? Why it's equal to 65? Answer code is not obvious.

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