- Build a Grocery List Program: Part 1 3:15
- Create a Method That Returns a Hash 1 objective
- Build a Grocery List Program: Part 2 3:58
- Create a Method That Returns an Array 1 objective
- Build a Grocery List Program: Part 3 3:47
- Method Returns with Hashes and Arrays 1 objective
- Build a Grocery List Program: Part 4 4:17
- Working with Hashes That Contain Arrays 1 objective
- Ruby Collections: Review 6 questions
Preview
Video Player
00:00
00:00
Build a Grocery List Program: Part 4
4:17Now that we know how to use arrays and hashes, we're going to build a small program that makes a grocery list for us. In this video, we'll clean up and put the finishing touches on our grocery list program.
So when we last left off,
we had printed out our list.
0:00
And let's go ahead and run this again.
0:05
The item is Milk and
we only want one thing of milk.
0:08
Okay, let's clean up how
this looks a little bit.
0:11
First, since we're sort
of duplicating code here,
0:15
by printing out a separator, let's go
ahead and make a method out of that.
0:19
And we'll call that
method output_separator.
0:24
You know what?
Let's call it print_separator.
0:31
And we'll give it an argument of
the character that we wanna print.
0:34
And we can go ahead and
give this a default value of a dash.
0:39
And all this method is going to do
is print that character 80 times.
0:46
Now let's go ahead and
0:55
replace the printing of
the separator with the method name.
0:56
Okay.
1:06
Clear my screen here and run this again.
1:09
You know what I can
take out the list here.
1:13
I can take out the list inspection
since we're printing it on our own now.
1:16
This name is Groceries, and
the item that we're adding is Milk.
1:21
And 1.
1:26
Okay, now we have a separator.
1:27
But let's go ahead and
clean this up even a little bit more.
1:31
So now let's go ahead and
indent each line here.
1:35
So we'll print a tab character
Inside of this list and
1:38
the item's name and then another plus.
1:43
And let's say we'll do three tab
characters here and the quantity.
1:46
Now I want quantity to be
all on the same line so
1:51
I'm going to add another plus and
take out that put statement.
1:55
And this will create one big string and
2:03
send it in as an argument
to the puts method.
2:06
Let me clear my screen here, click in
to the console and run this again.
2:09
Okay, this is looking a little bit better.
2:20
We've got our grocery list, and
our item of milk, and our quantity of one.
2:22
Let's go ahead and
say that we want to add another list item.
2:28
Print my screen and run this again.
2:34
List name is Groceries.
2:35
The item is Milk, and we only want one.
2:38
Bread, we're gonna say we
want two loaves of bread.
2:40
And that looks good.
2:43
We've got a separator in
between each of the items.
2:44
But you know what?
2:48
Let's go ahead and print the separator at
the end of all the list items instead.
2:49
I think that'll look
just a little bit better.
2:53
And now let's go ahead and
just add another item to the list.
3:00
And in fact before we print the list,
I'm just going to print here's your list.
3:05
And a new line.
3:13
In fact let's go ahead and
add another message and say great.
3:16
Add some items to your list.
3:20
Now let me clear my screen here,
there's gonna be more output so
3:25
I'm gonna make this a little bit
bigger and type ruby shopping_list.rb.
3:28
This name is Groceries Great.
3:35
Let's add some items to the list.
3:37
Milk, we only need one.
3:40
Bread, two loaves of bread.
3:42
Eggs, let's get three dozen eggs
because we're really hungry.
3:45
All right, and here is our grocery list
with our three different items and
3:50
the corresponding quantities.
3:55
In this course, we've learned about
how arrays and hashes work, and
3:58
have even learned some simple iteration.
4:02
Don't stop now, though.
4:05
Make sure to practice these
concepts on your own, and
4:07
practice by building your own programs.
4:10
If you need inspiration,
check out the extra credit.
4:12
Happy coding.
4:16