How to write If ELSE statement in Google Sheets to Hide columns dependent on cell value

trying to write and if statement in google sheets to hide a range of columns dependent on cell value in D4

If D4 == 1 hide columns H:AA If D4 == 2 hide columns O:AA Else show A:AA

Code below:

var cell = "D4";
var value1 = 1;
var value2 = 2;
var value3 = 3;
var activeSheet = ss.getActiveSheet();

function HideColumn(); {
    If(cell == value1) {
        activeSheet.hideColumn("H:AA");
        Else If(cell == value2) {
            activeSheet.hideColumn("O:AA");
            Else If(cell == value3) {
                activeSheet.unhideColumn("H:AA");
            }
        }
    }
}