Time for action –making win and lose conditions

For any game alerts to even appear during game play, we need to create some if statements for every possible scenario available in each level. When this occurs, the score needs to be reset back to zero. To make the win and lose conditions, follow these steps:

Below the alertScreen() function, create a new function called restart():
```
function restart()
```
Create an if statement for a "win" game event when the first level has been completed and transitions to level 2:
```
  if gameEvent == "win" and currentLevel == 1 then
    currentLevel = currentLevel + 1
    changeLevel2()
    levelNum.text = tostring(currentLevel)
```
Note
The tostring() method converts any argument to a string. In the preceding example, the currentLevel value changes from 1 to 2 when a "win" game event occurs. The value will convert to a string format that the levelNum text object can display on screen for level 2.
Add an elseif statement for a "win" game event when the second level has been completed and when it notifies the player that the game has been completed:
```
  elseif gameEvent == "win" and currentLevel == 2 then
    alertScreen("  Game Over", "  Congratulations!")
    gameEvent = "completed"
```

Add another elseif statement for the "lose" game event at the first level. Reset the score to zero and replay level 1:

  elseif gameEvent == "lose" and currentLevel == 1 then
    score = 0
    scoreNum.text = "0"
    changeLevel1()

Add another elseif statement for a "lose" game event at the second level. Reset the score to zero and replay level 2:

  elseif gameEvent == "lose" and currentLevel == 2 then
    score = 0
    scoreNum.text = "0"
    changeLevel2()

Finally, add another elseif statement for gameEvent = "completed". Close the function with end:

  elseif gameEvent == "completed" then
    alertBox:removeEventListener("tap", restart)
  end
end

Now, we need to backtrack and add an event listener
to the alertScreen() function using the alertBox object. We will add it to the bottom of the function. This will activate the restart() function:
```
  alertBox:addEventListener("tap", restart)
```

What just happened?

The restart() function checks all the gameEvent and currentLevel variables that occur during game play. When a game event checks for the "win" string, it also goes down the list of statements to see what comes out true. For example, if the player wins and is currently on level 1, then the player moves on to level 2.

If the player loses, gameEvent == "lose" becomes true, and the code checks what level the player lost in. For any level the player loses in, the score reverts to 0, and the current level the player was on is set up again.