1
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Hi there.

2
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Let's continue with our exercise would just stop that number five.

3
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So now let's solve.

4
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Number six.

5
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Consider the following variable names and inform which are invalid and why.

6
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I'm going to do this in the age damn male file.

7
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So I have the answers written here.

8
00:00:28,550 --> 00:00:32,240
So let me go back to the HDMI file.

9
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Here it is.

10
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Let me find this.

11
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So here are the variable names.

12
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I'm just going to write.

13
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The ones that are invalid.

14
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So the first one is name, we've all letters in caps.

15
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No problem with this.

16
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I don't like this style for naming variables, but this is valid.

17
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Be.

18
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Dollar sign num one.

19
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This is also valid.

20
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We can use dollar signs, we can use numbers, so no problem again.

21
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Now let us see.

22
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This one is invalid.

23
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Because type of.

24
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Is a reserved.

25
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Word, letter, the first name.

26
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This is also invalid because we have a dash.

27
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We can use underscores, but we can not use dashes so invalid.

28
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Because of.

29
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Bashes.

30
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Letter E attempt underscore to no problem with this one.

31
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Letter F.

32
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This one is invalid.

33
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Because it starts with a number so we can use numbers, but we cannot start with a numbers.

34
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So this is invalid and Ladder G.

35
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This is also invalid.

36
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Because of the empty.

37
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Space.

38
00:02:06,280 --> 00:02:07,630
So by saving this.

39
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And going back there.

40
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If we refresh the page, we can see that now our answers are here.

41
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If you want to make this more visible, you can enclose this in a strong.

42
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Tag like this.

43
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I'm just going to do the same thing for the others.

44
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Let me close this here.

45
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Same thing for this one.

46
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Now, if we save this and refresh the page.

47
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All right, so now we can see our answers better.

48
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So number seven, considered a block of code below.

49
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And guess what?

50
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Values will be shown in the console.

51
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So, again, I'm just going to go to the agency CML and write my guesses and then we can execute the

52
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code and see if this was right.

53
00:03:13,190 --> 00:03:16,210
So let's go to the AGM and file.

54
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We can find this inside this Bre-X element.

55
00:03:20,630 --> 00:03:23,510
So, again, let's get the strong tag.

56
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Let's put it here for our guests.

57
00:03:30,050 --> 00:03:35,390
So now we have vast quantity, no pressure and temperature.

58
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So in the first one, we have quantity and then we have the incremental operator.

59
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So normally this was going to result in 50.

60
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But actually, as you can see, this is a string.

61
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So what happens when we use the incremental operator with strings?

62
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We end up with a concatenation.

63
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So what's actually going to happen here is just concatenating twenty five with twenty five.

64
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OK, second one.

65
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So seven plus five divided by number plus two.

66
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So here we know that the first thing that's going to happen is what is inside the parentheses.

67
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So seven plus five equals twelve.

68
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Then we will have the division.

69
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So twelve divided by six equals two and then two plus two.

70
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My guess is that this is going to result in four.

71
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Now we have the pressure, we just created it.

72
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We did not assign anything.

73
00:04:53,630 --> 00:04:57,890
So if we do sold log, this is going to result in.

74
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Undefined, which is the lack of value of a variable.

75
00:05:03,910 --> 00:05:06,760
Now the same thing for the temperature this time.

76
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If we do this.

77
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We are going to see the No.

78
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Value for the temperature which we assigned to it.

79
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And now the type of these variables.

80
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So the first one we know that undefined is both a value and a type.

81
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So the type is also going to be undefined.

82
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And no is a value, but it's not a data type.

83
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So if we try to get the type of this variable, we know that we're going to get an object in return.

84
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Let's see if this is right.

85
00:05:43,480 --> 00:05:47,590
I'm just going to save this before refreshing the page.

86
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Let's just copy this code.

87
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Go back there.

88
00:05:51,160 --> 00:05:53,100
Go to the J.S. file.

89
00:05:53,140 --> 00:05:55,830
So this is number seven.

90
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So number seven, let's copy all this.

91
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Now, refreshing the page.

92
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We have all the results here.

93
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Let's see if this is right.

94
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So the first one I said.

95
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Twenty five.

96
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Twenty five.

97
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This is correct.

98
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Then four.

99
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Undefined, no undefined.

100
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An object.

101
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So everything's correct.

102
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Now going to the last one.

103
00:06:29,210 --> 00:06:32,570
Do the transformations to the you or else below.

104
00:06:33,980 --> 00:06:38,840
So first, we need to include age DTP as to the string.

105
00:06:39,110 --> 00:06:41,230
We can just do concatenation.

106
00:06:41,480 --> 00:06:43,910
So let's get the ideas of the elements.

107
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So the first one is you were out.

108
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One.

109
00:06:49,090 --> 00:06:50,870
Then we have you around, too.

110
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You are out three and you are out for.

111
00:07:01,050 --> 00:07:02,100
So number eight.

112
00:07:04,480 --> 00:07:08,090
You can just create one variable for each of the results.

113
00:07:08,290 --> 00:07:12,070
So the first result is going to be you are out one.

114
00:07:12,370 --> 00:07:23,580
So here we are going to use document that get element by I.D. and the I.D. is your real one.

115
00:07:24,660 --> 00:07:27,610
So what we need to do here is adding the H.

116
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D to P.

117
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S.

118
00:07:29,160 --> 00:07:31,770
So this is pretty simple to do.

119
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We can just add it right here.

120
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So H CTP s plus the content of that first element.

121
00:07:42,090 --> 00:07:42,660
Now.

122
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We just forgot the inner ASTM, Al.

123
00:07:53,630 --> 00:07:54,830
Now, this is better.

124
00:07:56,000 --> 00:07:57,830
So now let's get this.

125
00:07:59,130 --> 00:08:08,700
And do documents get element by I.D. your are to that inner ASTM al equals, then we can just paste

126
00:08:09,240 --> 00:08:14,820
the you are al that we formed by concatenating the H tdb s..

127
00:08:15,730 --> 00:08:16,290
All right.

128
00:08:16,320 --> 00:08:19,320
Before moving on, let's see if this one is right.

129
00:08:20,160 --> 00:08:21,150
So refreshing.

130
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The page going down there.

131
00:08:23,670 --> 00:08:25,260
We can see that this is working.

132
00:08:25,440 --> 00:08:28,660
So now we need to do the opposite with this one.

133
00:08:28,680 --> 00:08:30,780
We need to remove the HTP.

134
00:08:30,910 --> 00:08:31,450
S.

135
00:08:31,950 --> 00:08:34,590
So I'm just going to copy both lines.

136
00:08:37,080 --> 00:08:38,880
So now you are out to.

137
00:08:42,630 --> 00:08:43,830
It's going to be.

138
00:08:45,940 --> 00:08:52,270
That element which has the idea of you around three, if you want, you can just go back here and check

139
00:08:52,270 --> 00:08:53,260
it by yourself.

140
00:08:53,650 --> 00:08:56,430
As you can see, this is you are out three.

141
00:08:56,740 --> 00:08:58,700
And the next one is you around four.

142
00:08:59,200 --> 00:09:02,080
So here we have the full Google you around.

143
00:09:08,000 --> 00:09:11,870
And now we can just do your L two equals.

144
00:09:12,350 --> 00:09:15,400
You are out two dots replace.

145
00:09:15,710 --> 00:09:16,880
You can do like this.

146
00:09:16,970 --> 00:09:23,570
Or if you don't want to repeat this, what you can do is just include parentheses here.

147
00:09:24,580 --> 00:09:31,510
I like to do this to organize, so now I know that inside here I'm going to have the exact value.

148
00:09:32,580 --> 00:09:34,320
That's inside that element.

149
00:09:34,560 --> 00:09:37,700
And then we can just do a replace method.

150
00:09:39,310 --> 00:09:42,520
And then we are going to replace the Age CTP as.

151
00:09:44,320 --> 00:09:46,540
Colin Ford slashed Ford's slash.

152
00:09:46,840 --> 00:09:49,710
We are going to replace it with an empty string.

153
00:09:50,960 --> 00:09:54,170
So now we get the you are out for.

154
00:09:57,720 --> 00:10:02,190
And send the content of this string that we just formed.

155
00:10:02,430 --> 00:10:03,930
Let's see if this is right.

156
00:10:08,720 --> 00:10:14,330
So now we can see that we successfully removed the HTP ask from the you are out.

157
00:10:14,630 --> 00:10:15,620
So that was it.

158
00:10:16,130 --> 00:10:21,590
I hope you like this exercise and that you were able to do it without any problem.

159
00:10:21,680 --> 00:10:26,390
So in the next we do, we are going to start diving deeper into JavaScript.

160
00:10:26,690 --> 00:10:27,460
I'll see you then.