Increasing Column Letter by One using Google Apps Script

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Increasing Column Letter by One using Google Apps Script

This is a sample script for increasing the column letter by one using Google Apps Script.

Sample script

const increase = (ar) =>
  ar.map((e) => {
    const idx = [...e].reduce(
      (c, e, i, a) =>
        (c += (e.charCodeAt(0) - 64) * Math.pow(26, a.length - i - 1)),
      -1
    );

    // Ref: https://stackoverflow.com/a/53678158
    columnIndexToLetter = (n) =>
      (a = Math.floor(n / 26)) >= 0
        ? columnIndexToLetter(a - 1) + String.fromCharCode(65 + (n % 26))
        : "";

    return columnIndexToLetter(idx + 1);
  });

const samples = ["A", "Z", "AA", "AZ", "ZZ"];
const res = increase(samples);
console.log(res); // <--- [ 'B', 'AA', 'AB', 'BA', 'AAA' ]

• When this script is used, the column letters of ["A", "Z", "AA", "AZ", "ZZ"] is increased by one. As the result, [ 'B', 'AA', 'AB', 'BA', 'AAA' ] is obtained.

Testing

• jsfiddle.net