Enum HorizontalAlignment

const body =     DocumentApp.getActiveDocument().getActiveTab().asDocumentTab().getBody();  // Insert a paragraph and a table at the start of the tab. const par1 = body.insertParagraph(0, 'Center'); const table = body.insertTable(1, [['Left', 'Right']]); const par2 = table.getCell(0, 0).getChild(0).asParagraph(); const par3 = table.getCell(0, 0).getChild(0).asParagraph();  // Center align the first paragraph. par1.setAlignment(DocumentApp.HorizontalAlignment.CENTER);  // Left align the first cell. par2.setAlignment(DocumentApp.HorizontalAlignment.LEFT);  // Right align the second cell. par3.setAlignment(DocumentApp.HorizontalAlignment.RIGHT);