- Preparing to Build the Classes 0:34
- Practice Brainstorming Properties
- Player Properties Solution 2:57
- Token Properties Brainstorming
- Token Properties Solution 2:33
- Build the createTokens() Method
- createTokens() Method Solution 3:06
- Board and Space Class Constructor Methods
- Board and Space Class Constructor Methods Solution 3:58
- Build the createSpaces() Method
- createSpaces() Method Solution 2:46
- Game Class Constructor Method
- Game Class Constructor Method Solution 2:45
- Reviewing Constructor Methods and Generating Objects 5 questions
Preview
Video Player
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Board and Space Class Constructor Methods Solution
3:58See the solution for the Board and Space class constructor methods.
Welcome back, let's talk about the Board
and Space constructor methods.
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Jump over to the Board.js file.
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You should feel pretty confident with
class declarations at this point in
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this course.
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But just in case,
double-check your syntax against mine.
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The constructor method for the Board.js
file is pretty simple, so as you can see,
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I've preloaded the solution.
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You might have noticed that no arguments
are passed to the constructor method.
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This is because each game will
only have one Board object, and
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we're statically setting
the number of rows and columns.
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In future more advanced versions of
this game, we could design it so
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that the user could set the board size
to any number of rows and columns.
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And all aspects of the game
would be adjusted as needed.
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A feature like that would add many
layers of complication to the game.
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But if you're feeling
adventurous after this course,
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I really recommend that you give it a try.
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In the meantime, we're going to
stick with 6 rows and 7 columns, and
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set those figures in
the Board constructor method.
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Now I've set the spaces
property to an empty array.
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This should seem really similar to how
you define the tokens property inside
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the Player class constructor method.
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In the next step, you're going to build
the method that generates the spaces to
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populate this array, and set this property
to the return value from that method call.
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But for now, just keep the property
value set to the empty array.
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Once your constructor method for the Board
class matches what you see on screen,
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head over to the Space.js file.
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And keep watching to see the solution for
the Space class constructor method.
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This constructor method is a bit more
complicated than the Board class
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constructor, so we'll code it together.
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Hopefully your class declaration matches
mine, but if not, pause here and
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take a moment to sync up.
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So inside the Space class declaration, I'm
going to write in an empty constructor.
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The first two properties we will define
in the construction method are x and y.
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These are the coordinate values
of the Space on the board,
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this way we know what Space
object is located where.
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This is really important to know when
it comes time to dropping tokens into
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the board.
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When we create the Space objects in
the creator method in the next step,
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we'll be passing these values in.
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So for now, I'll set the constructor
method up to receive the x and
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y values and set the properties
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Let's talk about the id property now.
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If you recall, the token objects we built
previously have HTML representations that
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needed unique identifiers, so
they could be styled with CSS or
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manipulated with JavaScript.
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The Space objects are no different.
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So the id property for the Space objects
will be set to a template literal that is
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a concatenation of the word space and
the Space's x and y property values.
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Template literals make it easy to create
string values that use variables inside
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the string.
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For a template literal to work,
it needs to be enclose in back ticks.
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Note the difference between a back tick
and a regular single quotation mark.
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The final property to set right
now is the token property.
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The token property is way
to represent whether or
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not a given Space is holding a token.
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In other words,
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it's a way to tell if a token has been
dropped in to that particular Space.
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Since the board is empty of
tokens when the game begins,
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each Space will have a null value for
the token property.
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Eventually, when a token is dropped
into a Space, the value for
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that Space's token property will be set
to the token object the space contains.
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Okay, great job.
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By now, you've declared all five of the
classes that we'll use to run the game.
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You've also built the constructor
methods for four of these classes.
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The building blocks of this game
are quickly coming together.
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I encourage you to take a moment and check
out the Treehouse Community to chat with
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other students about the game's design.
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Things you would've done differently,
or things you're not sure about.
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If you're able to help answer
any fellow students questions,
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I really encourage that too.
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When you're ready, head to the next
step to build the create spaces method.
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