How to Convert a Google Sheets Column Index to its Letter Equivalent?

Convert Column Index to Corresponding Column Letter in Google Sheets

When working with Google Spreadsheets, it can sometimes be necessary to convert a column index to its corresponding column letter. For example, if you have a spreadsheet with columns A, B, C, and so on, you may need to know the column letter for a specific index, such as 4 or 1.

Solution:

To convert a column index to its corresponding column letter, you can use the following function:

function columnToLetter(columnIndex) {
  var result = "";
  var quotient = columnIndex;
  while (quotient > 0) {
    var remainder = quotient % 26;
    if (remainder == 0) {
      remainder = 26;
    }
    result = String.fromCharCode(65 + remainder - 1) + result;
    quotient = Math.floor(quotient / 26);
  }
  return result;
}

Usage:

To use the columnToLetter function, simply pass in the column index as a parameter and it will return the corresponding column letter. For example:

console.log(columnToLetter(4));  // Output: D
console.log(columnToLetter(1));  // Output: A
console.log(columnToLetter(6));  // Output: F

Note:

The function assumes that the column index starts from 1, which is the convention used in Google Sheets. If your column index starts from 0, you can adjust the function as needed.

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