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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,530 --> 00:00:08,360 Now, in the last lesson, we created what is the basic structure of a love calculator using randomisation 2 00:00:08,420 --> 00:00:09,580 and Javascript. 3 00:00:09,680 --> 00:00:15,890 Now, wouldn't it be nice if we could give the user a custom message based on what they got as their love 4 00:00:15,890 --> 00:00:16,910 score? 5 00:00:16,920 --> 00:00:24,080 Now in order to do this we need a way of checking what score they got and responding differently based 6 00:00:24,080 --> 00:00:24,960 on that score. 7 00:00:25,160 --> 00:00:31,610 And to do that we need to use conditionals. The way that conditional statements work is, you can use the 8 00:00:31,850 --> 00:00:35,100 keyword if to evaluate a statement. 9 00:00:35,210 --> 00:00:42,440 For example, in this case, if the track is clear. And, if that statement is true, then it will carry out 10 00:00:42,530 --> 00:00:44,800 a particular sequence of code. 11 00:00:44,990 --> 00:00:46,870 But if that statement is false, 12 00:00:46,910 --> 00:00:48,510 so the track is not clear, 13 00:00:48,650 --> 00:00:53,950 then you can have an ELSE keyword that tells the computer what it should do instead 14 00:00:53,960 --> 00:01:01,850 in that case. And this, in programming, is known as control flow. We're essentially controlling the flow 15 00:01:01,940 --> 00:01:05,420 of our code depending on the current conditions. 16 00:01:05,450 --> 00:01:10,940 By the way I had a lot of fun building that toy train set in Keynote. In case anybody else is living 17 00:01:11,300 --> 00:01:17,150 in a cramped London apartment and you don't have the space for a full toy set, and you're probably too 18 00:01:17,150 --> 00:01:18,660 old to play with them anyways, 19 00:01:18,740 --> 00:01:20,610 Keynote is your best bet. Now, 20 00:01:20,630 --> 00:01:24,700 this is how we might express our little track scenario in code. 21 00:01:24,770 --> 00:01:26,670 So we have the keyword if, 22 00:01:26,690 --> 00:01:28,440 and then we have some parentheses. 23 00:01:28,630 --> 00:01:31,910 And inside the parentheses are some conditions. 24 00:01:31,940 --> 00:01:40,220 So if the track is equal to clear then we take the flow of the code into the curly braces straight after 25 00:01:40,550 --> 00:01:49,110 and then we run the function goStraight. However, if that condition is not true, i.e. track does not 26 00:01:49,140 --> 00:01:53,130 equal clear, then the code flows to the else statement, 27 00:01:53,370 --> 00:01:56,120 and we run the function turnRight instead. 28 00:01:56,130 --> 00:02:01,920 While this is an easy way of seeing how our code works, it doesn't look very good when we have lots and 29 00:02:01,920 --> 00:02:05,160 lots of code inside the if and else statement, 30 00:02:05,250 --> 00:02:10,940 so more commonly you'll see this code structured like this by Javascript programmers. 31 00:02:11,070 --> 00:02:17,130 So we say if, we test the condition, and that's followed straightaway by the block of code that will 32 00:02:17,130 --> 00:02:23,160 get carried out if that condition is true, and then we open up the else statement to specify what should 33 00:02:23,160 --> 00:02:28,710 happen if that condition is not true. And essentially, through the testing of these conditions, we get 34 00:02:28,710 --> 00:02:31,010 to control the flow of code, 35 00:02:31,300 --> 00:02:37,560 and that's why they're called conditionals. So let's use what we learned to edit our code in the love calculator. 36 00:02:37,710 --> 00:02:44,220 So we have a love score here and we know that we get a number between 1 to 100. 37 00:02:44,220 --> 00:02:46,710 So that will be the condition that we will test. 38 00:02:46,800 --> 00:02:53,310 So we will say if, which is the keyword here, and then we'll open up some parentheses to add our testing 39 00:02:53,310 --> 00:02:54,310 condition. 40 00:02:54,330 --> 00:02:59,850 So let's say that our condition was that loveScore is equal to 100. 41 00:02:59,850 --> 00:03:05,090 And in order to test for equality we're using three equal signs. 42 00:03:05,190 --> 00:03:10,340 And if that is true then this block of code will be executed. 43 00:03:10,620 --> 00:03:17,720 But if it's not true, i.e. else, then this block of code will be executed instead. 44 00:03:17,730 --> 00:03:21,380 So let's say that, if loveScore was equal to 100. 45 00:03:21,390 --> 00:03:23,730 Well that's pretty crazy, right? 46 00:03:23,790 --> 00:03:28,760 Then we should say something like, alert "Your love score is " this amount. 47 00:03:28,890 --> 00:03:30,990 And then we should give them an interpretation. 48 00:03:31,020 --> 00:03:38,190 Like, for example, "You love each other like Kanye loves Kanye.". 49 00:03:38,430 --> 00:03:45,420 But otherwise we just give them the plain old normal message where we tell them their love score. 50 00:03:45,420 --> 00:03:51,780 Now some might have realized that I would have to go through this many many times until I happened to 51 00:03:51,810 --> 00:03:56,430 get a love score that is 100, which is quite unlikely. 52 00:03:56,430 --> 00:03:58,680 I mean it's 1 percent likely, right? 53 00:03:58,890 --> 00:04:07,470 So what if we simply wanted to test for a range, say for example if the love score was between 70 and 54 00:04:07,470 --> 00:04:11,270 100, or if the love score was between 0 and 30? 55 00:04:11,340 --> 00:04:15,960 Well, in order to do that, then we would have to use something like greater than. 56 00:04:15,990 --> 00:04:20,980 So if love score was greater than 70 then we should get this alert, 57 00:04:21,030 --> 00:04:24,700 otherwise we get this simple one instead. 58 00:04:24,720 --> 00:04:29,680 So let's try this out and we get 58 on the first go. 59 00:04:29,820 --> 00:04:30,320 There we go. 60 00:04:30,360 --> 00:04:32,160 So we finally got above 70. 61 00:04:32,160 --> 00:04:33,780 We've got 76 percent. 62 00:04:34,020 --> 00:04:37,730 And we get told that we love each other like Kanye loves Kanye. 63 00:04:37,840 --> 00:04:40,300 I used to love Kanye. 64 00:04:40,620 --> 00:04:45,750 I thought I was Kanye. What if Kanye made a song about Kanye? 65 00:04:45,810 --> 00:04:47,710 Man that would be so Kanye. 6282

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