google app script documentation getRange code example

Example 1: google sheets get ranges

//getRange(row, column, optNumRows, optNumColumns);
Sheet.getRange(1,1,1,12);

//row --- int --- top row of the range
//column --- int--- leftmost column of the range
//optNumRows --- int --- number of rows in the range.
//optNumColumns --- int --- number of columns in the range

Example 2: getranges google script

let SS = APP.getActiveSpreadsheet();
let sheetIndex0 = SS.getSheets()[0];

sheetIndex0.getRangeList(['A1', 'B1:C7']).setHorizontalAlignment("center");