What is the most efficient method for transforming an index into a column number that resembles that of Excel using a functional approach?

Is there a way to write a function that can produce the correct column name for a given number, like A for 1 or AA for 127? I know this question has been addressed numerous times before, however, I am interested in approaching it from a functional perspective.

I understand that converting imperative solutions should be straightforward, but I often encounter difficulties when attempting to do so myself.

Does anyone have any innovative ideas or functional implementations?

Answer №1

Check out this functional solution.

var alphabets = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];

function convertToAlphabet(number) {

  if (!number || number <= 0) {
    return 0;
  }

  var code = "";
  for (var i = 0; i < Math.floor(number / 26); i++) {
    code += alphabets[i];
  }
  code += alphabets[(number % 26) - 1];
  
  return code;
}

console.log(convertToAlphabet(27)); // outputs AA;

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