var PRIZES = ["a new car", "a broken stapler", "a refrigerator"];
var door = prompt("Choose a door number (1,2,or3)");
var prize = PRIZES[door - 1];
if (prize <= 3 && prize >= 1);{
alert("you have won " + prize.toUpperCase() + "!!");}
else (door === undefined); {alert("not a door");}

var PRIZES = ["a new car", "a broken stapler", "a refrigerator"];
var door = prompt("Choose a door number (1,2,or3)");
var prize = PRIZES[door - 1];
if (prize <= 3 && prize >= 1);{
    alert("you have won " + prize.toUpperCase() + "!!");
}
else if (door === undefined) {
    alert("not a door");
}

var PRIZES = ["a new car", "a broken stapler", "a refrigerator"];
var door = prompt("Choose a door number (1,2,or3)");
var prize = PRIZES[door - 1];

if (prize <= 3 && prize >= 1)
{
    alert("you have won " + prize.toUpperCase() + "!!");
}
else if (door === undefined)
{
    alert("not a door");
}