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[MUSIC]

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Welcome back, we've done some great
work on our library app so far.

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We've declared three classes,
library, patron, and book, and

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added their constructor methods.

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Now it's time to start
adding some other methods.

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Our rough plan of attack included
two methods on the library class,

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addBook() and addPatron().

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These methods are our way
of entering a new book or

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new patron into the library system.

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These methods will take an actual book or
patron object and add it to the array of

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books and patrons stored in the library
object's books and patrons properties.

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Let's start with addBook().

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It makes sense that the addBook() method
should receive the book that's being added

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as a parameter.

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We can pass in an entire book object,

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like the one we created earlier that's
representing a Harry Potter book.

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Then we just need to add the book object
to the array stored in the library's books

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property using a simple
array method like push.

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This can be a simple, one-line method.

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addPatron() will work
exactly the same way.

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Open up the attached workspace to
find an updated read me file with

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new instructions.

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If you'd like to continue working
in your existing workspace,

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check out the teacher's notes for
the new directions.

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Once you're done, or

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if you need some help, check out
the solution following this video.

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Then we'll join back up to
test out our new methods.