How Can I Convert Column Index to Letter (and Vice Versa) in Google Spreadsheets?

Converting Column Index to Column Letter

In Google Spreadsheets, it can be challenging to obtain the corresponding column letter from its numerical index. This article provides a solution for converting column indices to column letters, helping you navigate your spreadsheets more effectively.

To achieve this conversion, JavaScript functions can be utilized:

• columnToLetter(column): This function takes a numerical column index as its parameter and converts it to the corresponding column letter.
• letterToColumn(letter): Performs the reverse conversion by converting a column letter to its numerical index.

Here's the implementation of these functions:

function columnToLetter(column) {
  var temp, letter = '';
  while (column > 0) {
    temp = (column - 1) % 26;
    letter = String.fromCharCode(temp + 65) + letter;
    column = (column - temp - 1) / 26;
  }
  return letter;
}

function letterToColumn(letter) {
  var column = 0, length = letter.length;
  for (var i = 0; i < length; i++) {
    column += (letter.charCodeAt(i) - 64) * Math.pow(26, length - i - 1);
  }
  return column;
}

Now, you can easily convert column indices to letters and vice versa using these functions. For instance:

getColumnLetterByIndex(4);  // Returns "D"
getColumnLetterByIndex(1);  // Returns "A"
getColumnLetterByIndex(6);  // Returns "F"

Give it a try and see how it simplifies your spreadsheet navigation!

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