I’m trying to utilise the exec function within a forEach loop, as follows:

Instead of writing

var editable = 'Editable Schedule';
var main = 'Main Schedule';

var editableSheet = spreadsheet.getSheetByName(editable);
var mainSheet = spreadsheet.getSheetByName(main);

I was hoping to do something like

var editable = 'Editable Schedule';
var main = 'Main Schedule';
['editable', 'main'].forEach(sheetName => exec('var ' + sheetName + 'Sheet = spreadsheet.getSheetByName("' + eval(sheetName) + '");'));

I’ve replaced exec with console.log to check the strings are being formed correctly, and it looks like they are. However, the line does not execute, instead it ets stuck and eventually times out. What am I doing wrong?