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You have completed Ruby Objects and Classes!
You have completed Ruby Objects and Classes!
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In this video, we create a simple class. The class will be modeled after the concept of a name and return the different attributes a name might have.
Code Samples
class Name
def title
"Mr."
end
def first_name
"Jason"
end
def middle_name
""
end
def last_name
"Seifer"
end
end
name = Name.new
puts name.title
puts name.first_name
puts name.middle_name
puts name.last_name
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Now that we know a little bit about how
objects and
0:00
classes work, let's create our own class.
0:02
We'll start small and create a class for
representing a name.
0:06
Before we jump straight in to coding, let's
think about how a name can be structured.
0:11
We're not going to get into everything
that can be possible with a name.
0:16
But for the purposes of the class we're
going to write, a name could have
0:20
the following items, title, first name,
middle name, and last name.
0:24
We create a class using the class keyword,
and
0:31
then the name of the class that we wanna
create.
0:34
Let's see how that works now using Work
Spaces.
0:37
So let's go ahead and create our first
class.
0:41
I've launched a Ruby Workspace here, and
on the left,
0:45
I'm going to right click and choose new
file.
0:48
And we'll name this name.rb.
0:53
And this is gonna be a simple class that
just returns my name.
0:56
So let's go ahead and dig in.
1:03
We start writing a class by using the
keyword class.
1:06
Then we type the name of the class.
1:10
Using an uppercase letter to start with.
1:14
In this case, the class name is going to
be Name.
1:18
[SOUND] And then we close it, by writing
end.
1:21
Now, if we wanted to have a longer class
name, that was more specific,
1:29
the convention behind that is doing
something like,
1:35
say, FirstName with no spaces.
1:38
But we're just gonna keep the name class
here, and let's go ahead and
1:43
think about the different components of a
name.
1:48
First we'll start with the title and
1:51
we're gonna create methods for all of
these different attributes.
1:53
And we'll say title and I'll go with
"Mr." this is a String.
1:58
And I have a first name, that's Jason.
2:08
[NOISE] I don't have a middle name but
2:15
I'm going to return an empty string and
2:19
I do have a last name, and that's going to
return "Seifer".
2:24
So now that we have this class written,
let's go ahead and instantiate it.
2:32
And let's just print out the name.
2:38
Go ahead and click into the console and
type ruby name.rb.
2:46
Now this returned, well, pretty much
nothing it has the name of the class, and
2:52
a colon, and a bunch of weird symbols
here.
2:56
And this is actually the address in memory
of the instantiated object.
3:01
But let's go ahead and
3:10
actually do something with the data that
we have inside here.
3:11
So we'll print out the title.
3:15
We're just calling a method.
3:18
[SOUND] And now we are calling all of
3:23
the different methods of this name object
3:29
which is an instance of the Name class.
3:36
Now let's run this again and see what
happens.
3:43
And it did exactly what we expected.
3:48
And print it out.
3:50
The results of these different methods.
3:52
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