Google Apps Script: Make Negative

README.md

A small macro to make every number in each cell negative.

MakeNegative.js

function MakeNegative() {
  var spreadsheet = SpreadsheetApp.getActive();
  var activeRange = spreadsheet.getActiveRange();
  var values = activeRange.getValues();
  values.forEach(function(row, rowId) {
      row.forEach(function(col, colId) {
          values[rowId][colId] = Math.abs(values[rowId][colId]) * -1;
      });
  });

  activeRange.setValues(values);
};