1
00:00:05,900 --> 00:00:08,960
In this lecture, we're going to talk about compound types.

2
00:00:09,320 --> 00:00:14,660
Compound types can be can group multiple values into one type.

3
00:00:14,870 --> 00:00:19,460
And rust has two primitive compound types, tuples and arrays.

4
00:00:19,640 --> 00:00:22,730
So we're going to start with what a tuple is.

5
00:00:23,420 --> 00:00:30,290
A tuple is a general way of grouping together a number of values with a variety of types and to one

6
00:00:30,290 --> 00:00:34,070
compound type tuples have a fixed length.

7
00:00:34,070 --> 00:00:38,060
So once they're declared, they cannot grow or shrink in size.

8
00:00:38,060 --> 00:00:40,040
So let's look at what a tuple is.

9
00:00:40,130 --> 00:00:45,230
So we'll say let two equals parentheses.

10
00:00:45,230 --> 00:00:50,510
And then remember they can be a ton of different values.

11
00:00:50,510 --> 00:00:56,240
So we'll just give them one an integer, one a string, and then one a boolean.

12
00:00:58,480 --> 00:01:00,550
So how can you access?

13
00:01:01,800 --> 00:01:04,270
These information, these data.

14
00:01:05,730 --> 00:01:07,260
Inside the variable too.

15
00:01:07,290 --> 00:01:14,280
So what we can do and we'll just print it out is set up our normal stuff.

16
00:01:14,280 --> 00:01:19,470
And then if you type to period, you see you have 012.

17
00:01:19,890 --> 00:01:20,850
So the way.

18
00:01:21,610 --> 00:01:29,620
Counting works and programming is the first element, which in this case is 500 always starts at zero.

19
00:01:30,280 --> 00:01:37,540
So we'll always go zero, one, two, and it works the same way in arrays and vectors and so on.

20
00:01:38,840 --> 00:01:39,530
So.

21
00:01:40,760 --> 00:01:43,610
The index of this is going to be zero.

22
00:01:43,610 --> 00:01:45,620
So if we typed out zero.

23
00:01:47,040 --> 00:01:51,210
And then we built it and run it.

24
00:01:51,540 --> 00:01:52,860
We see 500.

25
00:01:53,070 --> 00:01:55,350
But the same thing works as if we did one.

26
00:01:58,880 --> 00:02:01,490
And also if we did, too.

27
00:02:04,340 --> 00:02:09,170
So that's how you can access the information inside of a tuple that way.

28
00:02:10,100 --> 00:02:16,010
But say you want it to assign each value inside the tuple to.

29
00:02:17,300 --> 00:02:18,380
A different variable.

30
00:02:18,380 --> 00:02:24,940
So we'll say let X, Y and z equal to.

31
00:02:26,240 --> 00:02:33,920
So now we can inference that X is going to link to 500, y is going to be assigned to high and Z is

32
00:02:33,920 --> 00:02:35,360
going to be assigned to true.

33
00:02:35,390 --> 00:02:42,350
So to test this out, let's print out the values and let's see what happens.

34
00:02:42,350 --> 00:02:43,670
So we have X.

35
00:02:44,690 --> 00:02:47,300
And then we will copy and paste.

36
00:02:50,330 --> 00:02:53,630
Y z.

37
00:02:54,470 --> 00:02:57,020
Clear cargo build.

38
00:02:57,770 --> 00:02:58,780
Cargo run.

39
00:02:58,790 --> 00:03:04,160
And now we see that we have X is 500, Y is high and z is true.

40
00:03:04,310 --> 00:03:08,030
So that is how you can use a tuple to assign.

41
00:03:09,290 --> 00:03:11,270
Multiple values into one type.

42
00:03:11,270 --> 00:03:16,040
And then you can also pull those values out and assign them to different variables.

43
00:03:17,050 --> 00:03:22,300
And the next lecture, we're going to look at a raise, which is another way to have a collection of

44
00:03:22,300 --> 00:03:25,810
multiple values that all have the same type.