1
00:00:00,410 --> 00:00:03,000
So when we just left off we had
created a shopping list and

2
00:00:03,000 --> 00:00:05,040
printed out the contents.

3
00:00:05,040 --> 00:00:09,920
Now let's go ahead and add on to this and
add an item to this list.

4
00:00:11,150 --> 00:00:15,790
So let's go ahead and
call add_list_item dot inspect, and

5
00:00:15,790 --> 00:00:20,624
what that's gonna do is the call
the add_list_item method and

6
00:00:20,624 --> 00:00:24,890
then we're just gonna see
what the output is first.

7
00:00:26,110 --> 00:00:30,804
So we click down into the console and
type ruby shopping_list.rb.

8
00:00:30,804 --> 00:00:34,959
The list name is "Groceries", and we don't
have any items, so let's go ahead and

9
00:00:34,959 --> 00:00:35,650
add an item.

10
00:00:35,650 --> 00:00:38,951
And the item is Milk.

11
00:00:38,951 --> 00:00:39,950
Uh-oh.

12
00:00:39,950 --> 00:00:44,690
Undefined local variable or
method name for main object.

13
00:00:44,690 --> 00:00:46,050
That's because we spelled it wrong.

14
00:00:47,890 --> 00:00:51,070
Our program freaked out a little bit,
and that's okay.

15
00:00:51,070 --> 00:00:53,850
It exited, but
nothing catastrophic happened.

16
00:00:53,850 --> 00:00:56,660
So let's go ahead and
clear the screen, and run that again.

17
00:00:56,660 --> 00:00:59,660
And actually, let's put a space here,
format that just a little bit better.

18
00:01:01,130 --> 00:01:06,910
List name is "Groceries", and go ahead 
and add "Milk" to our grocery list.

19
00:01:06,910 --> 00:01:12,800
And we can see that we return
a new hash with the key of "name",

20
00:01:12,800 --> 00:01:14,630
and the value of Milk.

21
00:01:15,660 --> 00:01:22,350
And that's okay, but what I think I would
like to do is also get the quantity back.

22
00:01:22,350 --> 00:01:24,435
So let's go ahead and ask how much.

23
00:01:28,617 --> 00:01:32,300
And we'll get from standard input again,
and

24
00:01:32,300 --> 00:01:36,744
then call to_i on that,
which will turn it into a number.

25
00:01:40,264 --> 00:01:43,130
And now we'll put that into the hash.

26
00:01:44,850 --> 00:01:47,620
Now let's go ahead and
run this again and see what happens.

27
00:01:48,730 --> 00:01:51,190
List name is "Groceries".

28
00:01:51,190 --> 00:01:52,170
Item is "Milk".

29
00:01:53,320 --> 00:01:54,430
And I only want one.

30
00:01:56,470 --> 00:02:01,340
Now we can see that this add_list_item
method is returning a hash with two keys,

31
00:02:01,340 --> 00:02:02,790
"name" and "quantity".

32
00:02:04,930 --> 00:02:08,010
Now let's go ahead and take a look
at our list and see how it looks.

33
00:02:10,670 --> 00:02:13,580
Gonna clear my screen here and
run the program again.

34
00:02:19,020 --> 00:02:22,725
So here is the item that we're returning,
but

35
00:02:22,725 --> 00:02:27,570
it's not being added to our list
of items inside of the hash.

36
00:02:29,230 --> 00:02:30,940
So let's go ahead and fix that.

37
00:02:32,730 --> 00:02:38,530
What we're gonna do is use the push method
and the reason is "items" is an array.

38
00:02:40,600 --> 00:02:44,790
So let's go ahead and type list.push, and

39
00:02:44,790 --> 00:02:50,690
then the argument that we're
adding to push is all_list_item.

40
00:02:54,358 --> 00:02:57,410
Now, we can print out
the contents of the list again.

41
00:03:01,012 --> 00:03:03,920
Let me clear my screen here and
run it again.

42
00:03:05,780 --> 00:03:12,117
Okay, we've got our grocery list created,
"Milk", and we only need one.

43
00:03:12,117 --> 00:03:16,680
Uh-oh, undefined method push for
this hash.

44
00:03:17,930 --> 00:03:18,990
Now what could that be?

45
00:03:20,240 --> 00:03:24,660
Well, we're not pushing
onto the list hash.

46
00:03:24,660 --> 00:03:29,810
We're pushing onto the list
items inside of the hash.

47
00:03:31,900 --> 00:03:34,372
Now let's clear this and run it again.

48
00:03:38,511 --> 00:03:40,030
Okay.

49
00:03:40,030 --> 00:03:43,240
Now this is what our
grocery list looks like.

50
00:03:43,240 --> 00:03:49,250
It's a hash with two keys,
"name" which is "Groceries",

51
00:03:49,250 --> 00:03:55,003
"items", which is an array,
which contains a hash.

52
00:03:55,003 --> 00:03:57,770
In our next video we're
going to format this.