1
00:00:00,370 --> 00:00:07,830
Well let's head over back to court context and then after increased amount we have the decrease amount.

2
00:00:08,180 --> 00:00:13,940
However I also failed to mention that not only we're looking for the idea we're gonna need the amount.

3
00:00:14,050 --> 00:00:20,610
So we're going to say I.D. and the amount and the reason for that is because if impound is going to

4
00:00:20,610 --> 00:00:28,520
be less than one or in fact equal to one then instead of just setting the amount equal to zero so decreasing

5
00:00:28,530 --> 00:00:32,410
the item I'm in fact going to remove the item totally from the card.

6
00:00:32,600 --> 00:00:36,250
That's the reason why we're going to get two things from our cart item.

7
00:00:36,300 --> 00:00:41,110
And remember both of them we had access to the I.D. as well as the amount.

8
00:00:41,130 --> 00:00:47,280
So instead of just passing in the 80 in this case we're also going to pass in the amount and the functionality

9
00:00:47,280 --> 00:00:51,660
is going to be following where again we're getting both the I.D. and amount.

10
00:00:51,660 --> 00:00:59,580
And now we want to check if the amount is equal to 1 then I would want to remove the item altogether.

11
00:00:59,580 --> 00:01:01,320
How can we remove the item.

12
00:01:01,350 --> 00:01:03,510
Well we already have the functionality correct.

13
00:01:03,600 --> 00:01:08,210
So I can just say in here and say remove item and then pass the 80.

14
00:01:08,280 --> 00:01:10,050
And also I would want to right away return.

15
00:01:10,380 --> 00:01:13,710
So that would be the case if the amount is equal to 1.

16
00:01:13,790 --> 00:01:17,910
There is no point for us to decrease even more if the amount is already 1.

17
00:01:17,910 --> 00:01:22,800
There is no point for us to decrease to zero right away and just remove the item.

18
00:01:22,800 --> 00:01:28,170
Then we also can have setup else if of course the amount is not equal to one.

19
00:01:28,350 --> 00:01:29,420
What we would want to do then.

20
00:01:29,940 --> 00:01:36,570
And in that case we're going to do exactly the same thing but instead of the last one we're going to

21
00:01:36,570 --> 00:01:38,240
have a minus one.

22
00:01:38,250 --> 00:01:39,960
So we're gonna decrease by one.

23
00:01:39,960 --> 00:01:44,850
And you're looking at near like okay if that is the same functionality we could have set up some kind

24
00:01:44,850 --> 00:01:45,870
of a helper function.

25
00:01:46,020 --> 00:01:47,030
And that is true.

26
00:01:47,100 --> 00:01:49,170
You could set up the helper function.

27
00:01:49,170 --> 00:01:54,860
My issue with that is that that helper function essentially comes out longer than just copy and pasted

28
00:01:54,890 --> 00:01:55,760
in this case.

29
00:01:55,770 --> 00:02:00,930
So even though I'm not a fan of just copying pasting some kind of functionality because inevitably it

30
00:02:00,930 --> 00:02:02,460
does lead to bugs.

31
00:02:02,460 --> 00:02:08,970
In this case setting up the toggle functionality whether we are increasing or decreasing amount just

32
00:02:08,970 --> 00:02:10,890
seemed too much of work.

33
00:02:10,890 --> 00:02:14,860
So in this case I'm just gonna grab whatever functionality what he had here.

34
00:02:15,000 --> 00:02:19,340
We're gonna set this up again instead of plus one.

35
00:02:19,440 --> 00:02:22,500
That was our functionality for increasing the item.

36
00:02:22,500 --> 00:02:28,260
I'm just gonna go with decreasing the item and then of course since we have the new card I also want

37
00:02:28,260 --> 00:02:32,340
to use a set card is gonna be equal to a new card.

38
00:02:32,790 --> 00:02:39,960
So let me make sure that I'm still within the LS largest right set card is equal to my new card.

39
00:02:40,740 --> 00:02:43,700
So we're going to update our state value of work card.

40
00:02:43,920 --> 00:02:45,210
Now who would want to test it out.

41
00:02:45,240 --> 00:02:52,370
We're gonna have to head over to a card item and instead of increase amount we're going to import decrease

42
00:02:52,380 --> 00:03:02,430
amount decrease mound and then where we have the angle down instead of console logging we're going to

43
00:03:02,430 --> 00:03:08,070
run decrease amount increased amount of we're going to pass on to things we're going to pass in the

44
00:03:08,080 --> 00:03:11,960
80 as well as the amount let's say it.

45
00:03:12,060 --> 00:03:13,470
And now let's try it out.

46
00:03:13,470 --> 00:03:21,570
So if we remove the item notice our amount goes down by 1 and then eventually once our amount is equal

47
00:03:21,570 --> 00:03:25,530
to 1 then we just remove the item from the card altogether.