1
00:00:01,280 --> 00:00:09,630
I traitors are state full objects meaning once we have consumed a value from them it's gone.

2
00:00:09,630 --> 00:00:20,090
The next function compute the next value in a sequence given the ITER raters current state and the.

3
00:00:20,090 --> 00:00:21,820
I did it as always.

4
00:00:21,820 --> 00:00:26,880
Keep track of how much of the stream has already been computed.

5
00:00:27,340 --> 00:00:39,260
Let us call the next function on the object the ITER data object will be June 1 because this is the

6
00:00:39,260 --> 00:00:42,840
first time the next function is being called on this object.

7
00:00:42,890 --> 00:00:48,620
It is going to write down the first value in the sequence which is 1.

8
00:00:48,830 --> 00:00:54,100
And also this is going to change the item it does state.

9
00:00:54,230 --> 00:01:03,720
If we then make a call to the next function again by passing the same object or b j 1 it is going to

10
00:01:03,750 --> 00:01:09,120
return the next value in the sequence which is 4.

11
00:01:09,840 --> 00:01:18,450
So the return value is different from the previously calculated value and also once the ITER data invokes

12
00:01:18,450 --> 00:01:24,560
the next method the calculated while you get consumed and thrown away.

13
00:01:24,810 --> 00:01:32,560
Changing the item does state so when you call the next method or the next function.

14
00:01:32,580 --> 00:01:39,840
Again it's going to write on the next numbered in the sequence.

15
00:01:40,230 --> 00:01:48,330
So instead of returning the first item that the next function is called the ideation resumes where it

16
00:01:48,330 --> 00:01:49,290
left off.

17
00:01:49,290 --> 00:01:59,040
Also remember we can only go forward in a sequence but we cannot go backwards and once a value has been

18
00:01:59,040 --> 00:02:06,660
consumed we cannot generate the value again in order to better understand this concept let's look at

19
00:02:06,660 --> 00:02:07,660
an example.

20
00:02:07,730 --> 00:02:08,280
Let us.

21
00:02:08,280 --> 00:02:08,840
I did it.

22
00:02:08,850 --> 00:02:12,190
All the elements of the list using the next function.

23
00:02:12,240 --> 00:02:20,890
So we need to first convert this list into a nitrate that object in order to iterate over the element

24
00:02:20,950 --> 00:02:22,840
using the next function.

25
00:02:22,870 --> 00:02:36,750
So let us call the I directed object as ITER 3 and then assign this to the value added on by these ITER

26
00:02:36,750 --> 00:02:42,080
function next boss list 1 as an argument.

27
00:02:43,000 --> 00:02:45,250
So here we have the.

28
00:02:45,250 --> 00:02:48,570
I did 3 I directed object.

29
00:02:49,210 --> 00:02:51,680
So this is a list I deleted.

30
00:02:51,880 --> 00:03:02,490
Now let us call the next function on this item dated rated object so the first value in this sequence

31
00:03:02,880 --> 00:03:04,980
has been generated.

32
00:03:06,360 --> 00:03:08,820
It does not call the next function.

33
00:03:08,820 --> 00:03:16,210
Again so the next real you in this sequence has been generated.

34
00:03:16,220 --> 00:03:27,830
Now I want to see if the values 5 and 10 still exist in the AI iterator object sequence or not.

35
00:03:28,370 --> 00:03:29,850
So how can we do that.

36
00:03:29,900 --> 00:03:36,560
Let us pass this idea data object to a list and see the contents of the list.

37
00:03:36,560 --> 00:03:39,150
So let's pass the AI traitor object.

38
00:03:39,230 --> 00:03:43,730
I D E R three to the list and execute.

39
00:03:43,730 --> 00:03:51,730
So as we can see the elements 5 and 10 have been consumed by the next function.

40
00:03:51,770 --> 00:03:57,320
So these values have been removed from the item data object sequence.