Need help with WeaponSwitch Script

Thank you so much for your help in advance... I'm pretty new to unity so ya..

heres my script:

     function Start()
 {
     SwitchWeapon
 }
 
 function Update()
 {
     if(Input.GetKeyDown("1"))
     {
         SwitchWeapon(0);
     }
     else if(Input.GetKeyDown("2"))
     {
         SwitchWeapon(1);
     }
     else if(Input.GetKeyDown("3"))
     {
         SwitchWeapon(2);
     }
 }
 
 funtion; SwitchWeapon(index : int)
 {
     for(var i=0; i<transform.childCount;i++)
     {
         if(i==index)
         {
             transform.GetChild(i).gameObject.SetActiveRecursively(true);
         }
         else {transform.GetChild(i).gameObject.SetActiveRecursively(false);}
     }
 }