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Build an Address Book in Ruby

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Address Class: Part 1

5:00 with Jason Seifer

Contacts are going to have both phone numbers and addresses. In this video, we're going to define the `to_s` method on the address class and have it be able to take a formatting argument.

Now that our contact class is all set up, 0:00
we can start working on the other parts of the program. 0:02
Since they're not quite addressed by built in classes, 0:05
we're going to have to write our own. 0:07
Get it? 0:09
Addressed? 0:10
It's a bad pun about addresses. 0:11
Anyway, we'll be writing our own address class now 0:13
in addition to another supporting class for our program. 0:16
Let's get to it using workspaces. 0:19
So our contacts have phone numbers. 0:22
Now let's go ahead and have addresses for our contacts as well. 0:24
Now we can do that by creating another class for an address. 0:29
So we'll go ahead and create a new file, you can do that by right clicking and 0:35
selecting new file on the side bar, or go file and new file. 0:40
And we will call this address.rb. 0:44
So now we can create our address class. 0:50
And addresses are gonna be similar to phone numbers. 0:53
They can have a street with potentially two lines and then a city, state, and 0:56
postal code. 1:01
Now, we also wanna know what kind of address it is. 1:02
So, we'll put that in there as an attribute as well. 1:05
So we'll have the kind, the first line of the street address, 1:11
second line of the street address, the city, state, and postal code. 1:16
Now just like with phone numbers, let's go ahead and override the to_s method. 1:23
Except there are two different ways that we may wanna be formatting addresses. 1:29
So we can use that pattern that we used earlier with contacts, and 1:34
we'll say the format that we want by default is going to be short. 1:38
So now we can look at the format. 1:43
And let's go ahead and create a little string here, 1:47
to hold our address, which we will implicitly return. 1:52
Now when we're using the short format, we will add on the kind of address, 2:00
so we will say home, colon and then the street address all on one line. 2:10
That will be the first line of the street address. 2:20
And then we can say, 2:23
if there is a second line. 2:27
We'll add a space to this string because remember it's all on one line. 2:32
And then the street two attribute and 2:37
then we can return the comma and 2:42
the city, state and postal code. 2:47
And let's just go ahead and print that out real quick, and make sure it works. 2:54
This is not my real home address. 3:17
And let's just go ahead and print that out using the short format. 3:22
So now we'll run this very quickly and make sure it works. 3:27
And type ruby address.rb. 3:30
Okay, that looks good, and let's go ahead and create the long format as well. 3:33
So when the argument that we send in to this to_s method is long, 3:39
we will say it is the street_1 variable plus a new line. 3:45
[NOISE] And then we can also say, 3:52
here is the street two variable. 3:56
Plus a new line. 4:00
And remember we can put if statements all on the same line if we want to. 4:03
So we'll just say we'll add on to the address variable the street two variable, 4:10
and a new line if street two is not nil, and 4:18
then we could also add on the city, state and postal_code. 4:22
Now let's just go ahead and print a new line here. 4:35
And print it out in the long format as well. 4:42
Okay, that looks good. 4:48
We've got our home address printed in the short format and in the long format. 4:49
In our next video, we'll add this back to the contact class. 4:56