- The Big Picture 4:23
- Building the Foundation 6:09
- The Surface Is Fine and Powdery 5:23
- I Can Pick It Up Loosely With My Toe 3 questions
- Creating the Tableau 5:20
- Checking Suits 4:00
- Removing Cards 5:25
- Testing the Tableau: Adding Cards 3:39
- Testing the Tableau: Removing Cards 5:37
- Finishing the Pieces 3 questions
Preview
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00:00
Checking Suits
4:00In this video we'll see how we can check the suits of our cards, and then we'll finish up the 'addCards' function!
Getting back to our suitCheck function.
0:00
Let's use our new properties to
help us determine if the two cards
0:02
are different colors,
which can only happen in two ways.
0:06
Either card one is red, and card two
is black, or card one is black, and
0:09
card two is red.
0:14
So let's type if and
then add our brackets.
0:15
Then inside the if statement,
let's add parentheses for
0:20
our first case then add an or and
add parentheses for our second case.
0:24
Then let's jump back to our first case.
0:30
And check if c1 is red
by seeing if its suit is
0:33
contained by our redSuits property.
0:36
So redSuits.contains c1.suit.
0:39
Then let's add an and and
check if c2 is black.
0:44
blackSuits.contains c2.suit.
0:51
Now we just need to handle the second
case where card one is black and
0:56
card two is red, and I'll put this
on a new line so it's easier to see.
1:00
So inside our second case parentheses,
1:04
let's type blackSuits.contains c1.suit and
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redSuits.contains c2.suit.
1:15
And there we go.
1:19
Our suitCheck function
is basically finished.
1:20
We just need to add return true
inside our if statement, and
1:23
then add return false at
the bottom of the function.
1:27
Jumping back to our addCards function,
if this if statement is true,
1:31
then we want to add the new cards to
our current cards and return true.
1:36
So, inside this if statement,
let's update our tableau
1:41
pile by typing cards.addAll and
passing in our new cards list.
1:46
Then let's return true to let our
model know that it was a success.
1:52
Finally, let's return false
at the end of this function.
1:57
And we should be done, right?
2:02
Not quite.
2:03
We still need to handle the case
where our tableauPile is empty.
2:05
Remember, an empty tableauPile will
only accept a king as the first card.
2:09
Also, as we have it now,
2:14
an empty tableauPile will give us
an error when we try to use cards.last.
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There's no last card in an empty pile.
2:20
To fix this, let's only evaluate our
if statement if our Cards property
2:23
actually has cards in it.
2:28
At the top of the function,
let's type if cards is
2:29
greater than 0, add the left bracket and
2:34
then let's add the right bracket,
down here.
2:38
Next let's add an else if to
handle if a king is being played.
2:45
Else if (newCards.first().value
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== 12, which is the value of a king.
2:55
And finally, inside the else if,
let's just copy and
3:02
paste these two lines from up here.
3:05
And there we go.
3:15
Now when we run this function,
if there are cards in the tableau pile and
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the first new card meets these criteria,
3:22
then we'll add the new cards and
return true.
3:25
On the other hand,
if this tableau pile is empty but
3:29
the first a new card is a king, then we'll
also add the new cards and return true.
3:33
Otherwise, whatever cards we're
trying to add aren't a match.
3:41
So we'll just return false.
3:45
We're finally done with
the addCards function and
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all that remains is figuring out how
to remove cards from our tableau pile.
3:50
In the next video,
we'll see how we can do that, and
3:54
along the way, we'll learn all about for
loops in Kotlin.
3:57