1
00:00:01,660 --> 00:00:08,850
Come back in this lesson we're going to talk about strings that is essentially a set of characters sitting

2
00:00:08,850 --> 00:00:12,950
next to each other and building a string of text.

3
00:00:12,990 --> 00:00:16,480
So let's jump back to school.

4
00:00:16,530 --> 00:00:20,820
You may explore them very close down this project and say fine.

5
00:00:20,950 --> 00:00:29,780
New project this is going to be strings project these things are quite important.

6
00:00:29,790 --> 00:00:36,150
They tackle a lot of the different things that we do in development and we should get a very good you

7
00:00:36,150 --> 00:00:40,610
know sense of understanding and practice of them.

8
00:00:40,620 --> 00:00:44,430
So the first thing I want to show you is this.

9
00:00:44,430 --> 00:00:49,310
So far everything you have been doing you have actually been using strings.

10
00:00:49,320 --> 00:00:53,530
This is a string and that is how it's being written.

11
00:00:53,550 --> 00:00:57,930
So at sign quotations and then a string of characters.

12
00:00:57,930 --> 00:01:06,150
So if I want to do that with say a string I'm going to call it my E-String is.

13
00:01:07,080 --> 00:01:12,610
And then within the quotation marks I would write a string of characters.

14
00:01:12,660 --> 00:01:19,560
I doesn't really matter if you make either spelling mistakes or whatever because this will be treated

15
00:01:19,650 --> 00:01:23,790
as a string of values that you could do something with it.

16
00:01:23,790 --> 00:01:25,770
For instance you could print it.

17
00:01:25,830 --> 00:01:27,750
So let's see how you would do that.

18
00:01:27,750 --> 00:01:31,510
I'm going to say I have a very Abair called my a string.

19
00:01:31,770 --> 00:01:39,020
And then Indianness like in the print I'm going to say preens Maia's think so.

20
00:01:39,290 --> 00:01:43,720
I have a string and I'm going to end this log in data value.

21
00:01:44,090 --> 00:01:45,560
It's been done wrong.

22
00:01:54,420 --> 00:02:02,300
Now in the build we have this thing a string of characters which is exactly what we had.

23
00:02:02,300 --> 00:02:06,500
They are variable and now it's being shown in there.

24
00:02:06,540 --> 00:02:09,130
But what if I change the value of a string.

25
00:02:09,140 --> 00:02:18,290
What if I go ahead and say my string is actually going to be held instead of whatever it used to be

26
00:02:18,320 --> 00:02:18,800
for.

27
00:02:18,950 --> 00:02:25,190
So the next thing that we print is obviously going to print the most latest value that has been assigned

28
00:02:25,610 --> 00:02:29,350
to my string and now it means hello for me.

29
00:02:29,390 --> 00:02:37,570
Now this is a form out there and it's like preens values in a string variable.

30
00:02:37,880 --> 00:02:44,000
And by that I mean that the value that gets printed inside and a slot the value that gets fed into in

31
00:02:44,040 --> 00:02:51,230
a slide it will be printed as if it was in a string and that's the default behavior if you remember

32
00:02:51,230 --> 00:02:55,630
we had and this long I was saying hello world.

33
00:02:55,790 --> 00:03:00,680
And that's like the default behavior for the expects and insisting to be fed into it.

34
00:03:00,740 --> 00:03:09,090
The whole world did things such as Hello world for integer and then we would feed an integer into it.

35
00:03:09,260 --> 00:03:11,480
And that was type of formatting.

36
00:03:11,660 --> 00:03:13,640
So let's talk about that for a second.

37
00:03:13,650 --> 00:03:21,650
Let's see how we can for Maternus a string to show us different values as opposed to just text values

38
00:03:21,910 --> 00:03:23,550
and they go up here.

39
00:03:23,620 --> 00:03:30,730
I'm going to say integer Monnie integer is 32.

40
00:03:31,190 --> 00:03:38,520
And then in this string I'm going to say instead of that are you which is just a static value.

41
00:03:38,780 --> 00:03:44,320
Let's do this as a string string format.

42
00:03:44,650 --> 00:03:49,100
And this is the first time we're seeing this thing and this is the first time we are actually using

43
00:03:49,550 --> 00:03:50,660
a method.

44
00:03:50,660 --> 00:03:52,970
This is essentially calling a method.

45
00:03:52,970 --> 00:03:56,170
I'll talk about this much further in the future.

46
00:03:56,420 --> 00:04:04,600
I'm going to say the format I want to use is this percentage and my integer.

47
00:04:04,610 --> 00:04:06,800
Now what do you think this is going to do.

48
00:04:06,800 --> 00:04:11,100
This is going to say there is a string value called my string.

49
00:04:11,180 --> 00:04:17,880
It is formatted using an integer from this integer value.

50
00:04:18,020 --> 00:04:22,890
So essentially my string is going to be Turi and 2.

51
00:04:23,120 --> 00:04:29,730
It's an important distinction to make that is strange is not to read as hurty true.

52
00:04:29,810 --> 00:04:37,710
It is read as surely as a letter not a number and to again as a letter.

53
00:04:37,790 --> 00:04:47,690
If this was 30 to 65 8 9 that integer lovebird would read is as two hundred twenty six thousand five

54
00:04:47,690 --> 00:04:58,580
hundred eighty nine which is exactly what makes sense but this 3:11 we would read this theory 2 6 5

55
00:04:58,670 --> 00:04:59,830
8 9.

56
00:04:59,940 --> 00:05:06,830
We will then read as a numeric value anymore because we are a format that is to become a string of text

57
00:05:07,280 --> 00:05:21,540
and we removed that them will remove that buildup one again and it says it is 3 2 6 5 8 9.

58
00:05:21,550 --> 00:05:23,410
Not a number.

59
00:05:23,410 --> 00:05:24,520
Keep that in mind.

60
00:05:24,610 --> 00:05:29,500
And there's an warning here for me and you can get rid of that warning by doing this.

61
00:05:29,500 --> 00:05:34,860
You could say percentage at which is the object that is coming up.

62
00:05:34,960 --> 00:05:38,100
Whatever is the object feeding into here.

63
00:05:38,110 --> 00:05:43,600
The reason that is a warning is and it's like saying I'm not sure if the object you're feeding into

64
00:05:43,630 --> 00:05:49,930
me is exactly the type that they need in here I'm saying find the object unprinted exactly the way it

65
00:05:49,930 --> 00:05:50,680
is.

66
00:05:50,680 --> 00:05:57,490
So once again I know I'm rushing through some of this content but this is just to build your confidence

67
00:05:57,490 --> 00:06:03,220
and you get a better sense of you know different programming methods one step at a time.

68
00:06:03,220 --> 00:06:08,320
These things will become second nature for you so don't worry overly about them.

69
00:06:08,740 --> 00:06:15,310
Before I close this lesson however I should explain this R6 what it means and why we have that.

70
00:06:15,310 --> 00:06:20,740
Why is it that when I'm making an integer on my end there is no asterisks except that I'm making and

71
00:06:20,740 --> 00:06:22,930
this is throwing my a string.

72
00:06:22,930 --> 00:06:27,110
There is an Asterix and also what is this n s in here.

73
00:06:27,460 --> 00:06:28,850
So first thing first.

74
00:06:28,900 --> 00:06:34,820
And as is essentially a formatting for different value names in Objective-C.

75
00:06:34,830 --> 00:06:40,270
It has been removed from Swift and in the future you will just call this a string.

76
00:06:40,330 --> 00:06:42,210
When we are using our strength.

77
00:06:42,370 --> 00:06:49,660
But for now we can use an S on the best of my understanding and as it stands for next step and that's

78
00:06:49,660 --> 00:06:53,510
the company that Apple purchased so many many years ago.

79
00:06:53,710 --> 00:06:59,770
And also they got their programming technology with them but you can't just you know keep in mind that

80
00:06:59,770 --> 00:07:03,250
most everything they have an end as the beginning of it.

81
00:07:03,400 --> 00:07:13,360
And as aere my array and as mutable dictionary my dictionary so on and so forth these are things that

82
00:07:13,360 --> 00:07:17,020
we'll see some time in actually in this lesson.

83
00:07:17,080 --> 00:07:18,500
And this section actually.

84
00:07:18,700 --> 00:07:27,640
So an S is for that and the asterisks essentially returns a pointer where the pointer is something that

85
00:07:27,640 --> 00:07:31,250
we'll discuss in far more details in the future.

86
00:07:31,270 --> 00:07:41,230
But it's essentially a place right is a space in memory because this thing could be a very long it takes

87
00:07:41,490 --> 00:07:44,020
thing could be an entire book for instance.

88
00:07:44,020 --> 00:07:48,940
Another very good idea but it could be in theory because it could be very long.

89
00:07:48,940 --> 00:07:55,480
It's best if you place it somewhere in the memory and we get the location to that memory as opposed

90
00:07:55,480 --> 00:08:01,490
to having the actual text within our code because otherwise the record is going to be quite slow.

91
00:08:01,510 --> 00:08:08,830
So instead of actually accessing the value of the string we get the pointer to that space in the memory

92
00:08:09,130 --> 00:08:11,900
where the text is whenever you want to show it.

93
00:08:11,920 --> 00:08:16,830
We say well go to that memory space and fetch that value for us.

94
00:08:17,020 --> 00:08:24,430
Except for the very basic primitive variables such as integer archive of floats and booleans.

95
00:08:24,430 --> 00:08:31,170
Almost everything else needs an R6 as long as you are doing programming in Objective-C.

96
00:08:31,280 --> 00:08:36,700
Once we move to see if this whole thing is illuminated but for now for most everything we are going

97
00:08:36,700 --> 00:08:44,980
to be using on a which shows that it's memory space as a pointer to a memory space.

98
00:08:45,220 --> 00:08:49,840
So that's about that quick to reach out and assess things.

99
00:08:49,840 --> 00:08:56,200
They show us a string of there's a string of characters can be formatted different ways.

100
00:08:56,250 --> 00:09:01,180
We could just simply be a set of characters in a string.

101
00:09:01,220 --> 00:09:05,600
Are there strings and name of it is going to be.

102
00:09:05,710 --> 00:09:08,080
This is my voice.

103
00:09:08,180 --> 00:09:15,700
And now I could say and Aslaug what I copied out say preens other string as well.

104
00:09:15,910 --> 00:09:19,900
And if you print you can imagine that down here you will get to see.

105
00:09:19,900 --> 00:09:25,650
This is Iowas exactly what we have between the quotation marks.

106
00:09:25,750 --> 00:09:27,150
So that's about that.

107
00:09:27,160 --> 00:09:30,300
That's an introduction to strings in the next lesson.

108
00:09:30,310 --> 00:09:33,690
We're going to work on an assignment based on the strengths.