1
00:00:00,720 --> 00:00:02,040
How was that challenge?

2
00:00:02,040 --> 00:00:04,101
We're getting pretty far
into our library app.

3
00:00:04,101 --> 00:00:08,535
You just finished adding the check out and
return book methods to the patron class.

4
00:00:08,535 --> 00:00:12,050
You calculated and set the due
date inside the check out method.

5
00:00:12,050 --> 00:00:15,320
But there's another way this could
be accomplished that I prefer.

6
00:00:15,320 --> 00:00:17,020
Consider this.

7
00:00:17,020 --> 00:00:19,440
There's a property on the book
class called out, and

8
00:00:19,440 --> 00:00:22,130
it holds a Boolean value, true or false.

9
00:00:22,130 --> 00:00:25,130
The book either is or isn't checked out.

10
00:00:25,130 --> 00:00:26,980
The book has a due date property.

11
00:00:26,980 --> 00:00:32,110
These two properties are set manually in
the checkout method on the patron class.

12
00:00:32,110 --> 00:00:35,230
But wouldn't it be great if when
a book object is marked out,

13
00:00:35,230 --> 00:00:38,870
that it would trigger the due date
to be calculated and set as well.

14
00:00:38,870 --> 00:00:41,170
And of course,
when the book is marked back in,

15
00:00:41,170 --> 00:00:44,250
it would trigger the dueDate
property to be changed back to null.

16
00:00:45,590 --> 00:00:47,640
That is the beauty of setter methods.

17
00:00:47,640 --> 00:00:52,350
Marking a book as out or in and
calculating and setting a due date inside

18
00:00:52,350 --> 00:00:58,090
both the checkOut and return book methods
is a bulky way to go about these tasks.

19
00:00:58,090 --> 00:01:02,030
If we had a setter method for the out
property, we could also figure out the due

20
00:01:02,030 --> 00:01:06,450
date, and set or unset the due
date property at the same time.

21
00:01:06,450 --> 00:01:10,500
Meaning our check out and return book
methods would become a lot more concise.

22
00:01:11,550 --> 00:01:13,990
Let's refactor our code a little
bit to try this new approach.

23
00:01:15,090 --> 00:01:17,920
Open up the attached workspace for
an updated readme or

24
00:01:17,920 --> 00:01:20,530
check out the teacher's notes for
the new instructions.

25
00:01:20,530 --> 00:01:24,550
The following step provides a text based
explanation of what we've discussed in

26
00:01:24,550 --> 00:01:28,750
this video and might offer some more
insight if you're feeling confused.

27
00:01:28,750 --> 00:01:32,100
Give the coding a try and then check out
the solution before joining me again.