Will not create the array

ok so the code i have below doesn't give any compiler errors is just wont give me my variable to create the number of arrays i want so to speak i have attached pictures to try and help you understand what i mean.

code

 var menuItems : MenuItem[];

 var currentMenuItem : int = 0;

 function Update()
 {
 if(Input.GetAxisRaw("Vertical") > 0.9)
 {
     currentMenuItem--;
     if(currentMenuItem < 0) currentMenuItem = 0;
 }
 else if (Input.GetAxisRaw("Vertical") < -0.9)
       {
     currentMenuItem++;
     if(currentMenuItem >= menuItems.length) currentMenuItem =
          menuItems.length - 1;

} }