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Welcome back,

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congrats on finishing the final step
in developing our foreign arrow game.

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We are done, let us go over
the solution for the last assignment.

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First, you were tasked with adding
a method to the player class

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called checkTokens().

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This methods job is to tell us if
a player has any unused tokens left.

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If they've used all their tokens,
they can't play anymore.

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We used another ternary expression here.

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If the length of
the unusedTokens array == 0,

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then we return false,
if it's not 0, we return true.

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Okay, let's move to game.js to review
the final method updateGameState().

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The updateGameState() method receives
two arguments, token and target.

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Token is the token object that was
most recently dropped by a player and

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target is the space object
that that token now occupies.

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Your first step inside the updateGameState
method was to associate

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the space object with a droped token.

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This is done using the mark method
you wrote earlier in this stage.

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We call the mark method on the target
space and pass in the dropped token.

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As you recall,

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this will set the target spaces token
property to the droped token object.

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The next step is to check if
the last move was a winning move.

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This is done with a simple
if else statement.

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If it was a winning move, we pass
a message to the gameOver method and

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that's it.

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If it wasn't, we have some other steps
to take that logic is all handled

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in the first part of
this if else statement.

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First we switchPlayers(),

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that's simply a call to the
switchPlayers() method you wrote earlier.

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Then we use another if else to check that
the newly activePlayer still has tokens.

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If they don't have tokens available,
then they can't complete their turn and

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the game is over.

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If they do have tokens left, then we
need to render a new HTML Token for

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them using the drawHTMLToken() method
you wrote much earlier in the course.

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After that, we set the game
state back to ready and voila.

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That's a wrap on four in a row.

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Come watch me and a fellow teacher
play the game in the next video.