1
00:00:00,750 --> 00:00:06,560
I want to talk quickly about the idea of clean code something that we've talked about before and this

2
00:00:06,560 --> 00:00:10,930
is a good example to do with something like a function.

3
00:00:10,970 --> 00:00:21,580
For example let's say we had a function that perhaps checks if a number is even or odd so let's say

4
00:00:22,780 --> 00:00:33,310
is odd or even as a function that takes in a number and we're going to hear say well how are we going

5
00:00:33,310 --> 00:00:34,200
to check.

6
00:00:34,210 --> 00:00:45,350
Well we can use the modulo operator I can say if no modulo 2 which remember gives us the remainder.

7
00:00:45,460 --> 00:00:49,780
And if it's an even number the remainder is always going to be zero.

8
00:00:49,780 --> 00:00:52,570
So this is going to tell us if it's an even number.

9
00:00:52,570 --> 00:01:05,350
So if it's an even number then I want you to return true and if it's not an even number.

10
00:01:05,350 --> 00:01:13,000
So let's say now to doesn't equal zero.

11
00:01:13,040 --> 00:01:21,030
So if this is an odd number there is always a remainder in that case we return false.

12
00:01:21,230 --> 00:01:27,140
So maybe let's change this function to be more descriptive is even.

13
00:01:27,410 --> 00:01:33,870
So it's going to return true if it's even false if it's not even so in here.

14
00:01:34,060 --> 00:01:43,300
If I do is even and give it 50 and I run I get a narrow because I have to make sure that I do an L.

15
00:01:43,600 --> 00:01:55,650
If statement here we have to print here so let's do print and click Run I get true if I do 51 and click

16
00:01:55,650 --> 00:01:58,450
Run I get false.

17
00:01:58,470 --> 00:01:58,740
All right.

18
00:01:58,740 --> 00:02:02,220
It seems to be working but how can we clean up this code.

19
00:02:02,880 --> 00:02:04,190
Well here's the thing.

20
00:02:04,200 --> 00:02:10,750
We have some ways that we can actually make this a little bit tighter.

21
00:02:10,800 --> 00:02:22,820
For example if we're only checking for is even we don't really need to check this again because if no

22
00:02:22,830 --> 00:02:24,570
module or two doesn't equal 0.

23
00:02:24,570 --> 00:02:29,460
That is if a number divided by two doesn't always have a remainder of zero.

24
00:02:29,460 --> 00:02:30,900
We always know that that's.

25
00:02:30,990 --> 00:02:31,890
Well it's not gonna be.

26
00:02:31,890 --> 00:02:34,860
Even so we don't even need the statement.

27
00:02:34,860 --> 00:02:39,140
We can just say else right.

28
00:02:39,330 --> 00:02:42,990
So that if I run this this still works.

29
00:02:42,990 --> 00:02:43,280
Sorry.

30
00:02:43,310 --> 00:02:45,750
So we've cleaned up our code a little bit.

31
00:02:46,490 --> 00:02:47,270
But here's the thing.

32
00:02:47,390 --> 00:02:54,980
Another thing we could do is we know that return access the function automatically so we don't even

33
00:02:54,980 --> 00:02:56,940
need the else statement.

34
00:02:57,140 --> 00:03:05,910
I can just say return here because it's only going to get to line 5 if this statement is not correct.

35
00:03:05,930 --> 00:03:11,230
So if it's not even well I'm going to skip line four and go to line five.

36
00:03:11,540 --> 00:03:15,300
So that if I run this this still works.

37
00:03:15,490 --> 00:03:15,850
All right.

38
00:03:15,850 --> 00:03:18,340
But we can make this even cleaner.

39
00:03:18,400 --> 00:03:18,920
Right.

40
00:03:19,000 --> 00:03:21,090
Because right now we're just returning.

41
00:03:21,090 --> 00:03:27,950
True or false and usually if you have something like this we're returning true false directly.

42
00:03:28,110 --> 00:03:34,110
There is usually a better way and that's using an expression that evaluates to a Boolean.

43
00:03:34,560 --> 00:03:44,930
We can actually do is simply say hey remove all of this and I want you to just return like this and

44
00:03:45,230 --> 00:03:55,110
if we run this this still works and if I do 50 this still works because what we're saying here is I

45
00:03:55,110 --> 00:03:58,290
want you to return whatever this value is.

46
00:03:58,290 --> 00:04:03,360
And this is an expression right that's going to evaluate TRUE FALSE directly.

47
00:04:03,360 --> 00:04:07,560
So we get the exact same result as we had before.

48
00:04:07,590 --> 00:04:09,900
But look how much cleaner that is.

49
00:04:09,900 --> 00:04:12,140
That is just nice simple code.

50
00:04:12,150 --> 00:04:15,530
And as a developer I can come in here and right away see that.

51
00:04:15,540 --> 00:04:15,940
All right.

52
00:04:15,990 --> 00:04:20,830
Is even is just performing this operation and returning true or false.

53
00:04:20,880 --> 00:04:23,520
So this is a good way to think about clean code.

54
00:04:23,520 --> 00:04:26,180
How can you clean up your code and mind you.

55
00:04:26,220 --> 00:04:27,630
There's no perfect solution.

56
00:04:27,630 --> 00:04:29,420
You can always clean up code.

57
00:04:29,520 --> 00:04:36,520
But thinking like this really allows you to develop the way that advanced programmers think I'll see

58
00:04:36,520 --> 00:04:37,470
you in the next room.

59
00:04:37,510 --> 00:04:37,740
Bob.