dynamic data range from multiple tabs in a google sheet using QUERY function

Question

I'm trying to create a custom function so that I can dynamically return all the tabs within a spreadsheet to use within the QUERY function.

So that in the future if I add a new tab of data, I won't need to manually update the function.

function myFunction() {
  var out = new Array();
  var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
  for (var i=0 ; i<sheets.length ; i++) {
    var name = sheets[i].getName();

    if (i !== sheets.length - 1) {

      out.push("'"+sheets[i].getName()+ "'!$A:$F; " ); 
    } else {
      out.push("'"+sheets[i].getName()+ "'!$A:$F " );
    }
  }

  return out;
}

Example of how I will use my custom function

=query(myFunction(),"select * where Col4 = 'Partner' order by Col1 desc",0)

Answer 1

function getMyDataRanges() {
  var out=[];
  var sheets=SpreadsheetApp.getActive().getSheets();
  for(var i=0;i<sheets.length;i++) {
    var sh=sheets[i];
    var name=sh.getName();
    out.push("'" + name + "'!$A:$F"); 
  }
  return '{' + out.join(';') + '}';
}

I loaded the cell with something like this;

function loadFormula(sheetName,A1Range) {
  var ss=SpreadsheetApp().getActive();
  var sh=ss.getSheetByName(sheetName);
  var formula=Utilities.formatString('=QUERY(%s,"select * where Col4 = \'Partner\' order by Col1 desc")',getMyDataRanges());
  sh.getRange(A1Range).setFormula(formula);
}