- 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
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Build a Grocery List Program: Part 1
3:15Now 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 add methods to create our list and also add items to it.
[SOUND] Now that we know how
to use arrays and hashes,
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let's write a simple program that
uses everything we've used so far.
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We're going to do this over
a few different videos, so
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be sure to follow along using workspaces.
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Okay, now that we know how to work with
arrays and hashes, let's go ahead and
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write a simple shopping list program.
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So I've gone ahead and
launched a new Ruby workspace.
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Now, let's go ahead and create a new file.
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And we'll call this shopping_list.rb.
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Now let's go ahead and
create a shopping list.
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We'll create a method that asks for
the name of the list, and then,
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we can return a hash of the name and
the items inside of the shopping list.
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So we'll call that method, create list.
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Now let's go ahead and
ask what the list's name is.
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And we will take from standard input,
the name of the shopping list and
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remove any external characters from
it that are white space at the end.
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Now let's go ahead and return a new hash.
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We will give the hash a key of name and
a key of items.
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Which is a new array.
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And then, we'll go ahead and
return this hash.
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Now that we have a method to create
the list, let's go ahead and
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create a method to add
an item to the list.
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So now we're going to add a list item, and
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we'll get the item name
from standard input.
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And then we'll create a new hash,
and we can return that hash.
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Go ahead and save that.
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And now, let's go ahead and ask the user.
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Or their list.
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So we can say, list and
then an equals sign, and
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we'll call the method create list.
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Now what that will do is ask the user for
the name of the shopping list,
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and return a hash with the key of name and
the key of items, which is an array.
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And let's go ahead and
print out list.inspect.
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Now let's click down in the console and
run this shopping list program.
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The list name is Groceries.
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Now we can see we've got this list hash,
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with the name of what we input
in an empty array for items.
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In the next video,
we'll start adding items to the list.
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