Unpivot on Google Spreadsheet using Google Apps Script

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Unpivot on Google Spreadsheet using Google Apps Script

This is a sample script for converting the values on Google Spreadsheet as unpivot (reverse pivot) using Google Apps Script.

Sample script 1:

const SAMPLE1 = ([[, ...header], ...values]) =>
  header.flatMap((h, i) => values.map((t) => [h, t[0], t[i + 1]]));

• In the sample, the source data is "A1:D8". And, a custom function of =SAMPLE1(A1:D8) is put into "F1".
• When this script is used, the result showing the above image (most left table to middle table) is obtained.

Sample script 2:

const SAMPLE2 = v => {
  const [a, b, c] = v[0].map((_, c) => v.map(r => r[c]));
  const ch = [...new Set(a)];
  const rh = [...new Set(b)];
  const size = rh.length;
  const values = [...Array(Math.ceil(c.length / size))].map(_ => c.splice(0, size));
  const temp = [[null, ...rh], ...values.map((vv, i) => [ch[i], ...vv])];
  return temp[0].map((_, c) => temp.map(r => r[c]));
}

• In the sample, the source data is "F1:H21". And, a custom function of =SAMPLE2(F1:H21) is put into "J1".
• When this script is used, the result showing the above image (middle table to most right table) is obtained.