Branching Statements

Okay, so branching statements. 0:00 We talked very briefly about break, Ken you talked about 0:02 maybe you're going down the wall and you go woo, this milk's bad now. 0:05 You want to break, you want to just get out of this loop. 0:07 Get me out of here, I don't want to drink sour milk, the rest of these are all bad. 0:09 You can break out of the loop. 0:12 It's a keyword. 0:13 If you're inside of the loop and you say break, it will stop going. 0:14 Continue, we'll look at here in a second, but 0:18 what it does is as you're going through each one of the lines of the code there. 0:20 If you want to not run the rest of the lines below, you can call continue and 0:24 it will jump back to the top and run through again. 0:27 Labels are a thing. 0:30 You can be inside of a loop and say break, and 0:31 somehow they avoided the words saying go to, but you can go to a label. 0:36 And through the history of programming, go to is a bad thing. 0:40 It creates what is known as spaghetti code. 0:43 Which means that you try to follow code and 0:45 it looks like little strands of spaghetti. 0:47 And it's not a good thing. 0:50 You can solve a lot without using a label. 0:51 So I say use them sparingly, they're not common. 0:54 And if you get into a situation where you want to use one, check yourself. 0:56 [LAUGH] You don't want to 1:00 introduce spaghetti code. 1:03 You don't want somebody looking at your code, trying to be like, I went up here. 1:04 Am I over here, where? 1:07 You don't want that. 1:08 But they do exist, and you might see them. 1:09 And you can also return. 1:11 If you're inside of a loop, and there's something that you're, like, oh, 1:12 this method's done. 1:14 I don't need to do this thing at all anymore. 1:15 This whole method [INAUDIBLE]. 1:16 You can just call a return method there, and the loop will stop and 1:17 jump out, pop out. 1:20 Okay, so the last example that we have is the t-shirt give away. 1:21 So, while there's prizes left, we're gonna ask Is the attendee present? 1:24 If they're not here, we're gonna try again. 1:29 And let's try again here, can anybody think of what that is? 1:32 What's this try again? 1:34 We're gonna jump back up to the while. 1:35 There we go, continue, excellent. 1:38 So we're going to continue, we're going to come back up and 1:40 say is the attendant present? 1:43 If they are here, we're gonna ask what size. 1:44 And the reason why we don't want to continue, 1:45 we don't want to ask what size if they're not here. 1:47 There's no point to do this extra work that's down here, 1:49 we're not gonna give away a shirt to nobody either. 1:51 So we have to do that. 1:53 So what I did was I wrote some JavaScript that [INAUDIBLE] the meetup attendees. 1:53 And not 90 people are here, so we might have a continue problem. 1:59 We might need to check a continue, but 2:02 I am going to randomly sort that list and give out some t-shirts. 2:04 That sound good? 2:08 All right, you get a shirt, you get a shirt. 2:09 >> [LAUGH] >> All right, so 2:11 the t-shirt code is in here, called prizes. 2:15 Let's bring this down. 2:21 So I have a list that you don't need to see, that returns a shuffled 2:22 list of all of the Rsvps.shuffled at the time that we run this code. 2:26 And I am gonna keep track of the prizes that are given away, 2:29 and I am also gonna keep track of the drawingNumber. 2:32 And while we've given away five, 2:36 we are going to pull out of the RSVP list that number. 2:40 This is that for loop. 2:45 We could have written this with a for loop, but 2:46 notice that I'm using this drawing number. 2:49 We're gonna say, Is the person present? 2:51 If they're here and I have to remember to type no. 2:54 Then we're gonna continue. 3:00 So we're calling the continue keyword. 3:04 It's gonna go back up to the top. 3:05 It's not gonna run the rest of this. 3:06 And then we're gonna ask what size you are. 3:08 You can kinda imagine multiple bits of this continue or 3:11 multiple bits of this break. 3:14 This isn't working and there's a break. 3:15 Let's imagine that we went past 30 people and nobody's here, we would call break. 3:18 We can put in different sorts of things in here. 3:24 You could have a continue in here, you could have a break in here, 3:25 that sort of thing. 3:27 Then we'll do the prizes given away. 3:31 So I'm gonna assume that you publicly joined a meetup, 3:32 and your name's on the page already. 3:38 Your name might be in Treehouse Video, maybe. 3:40 So you kind of win two prizes, you win a shirt and Treehouse and 3:43 you'll be bummed out if you weren't here, cuz your name's gonna be in a video. 3:45 >> And you don't have a shirt. 3:48 >> If your name's in the video and you see this at home and you weren't here, 3:50 I'll send you a shirt, okay. 3:54 >> [LAUGH] >> You're gonna get so busted. 3:55 All right, [LAUGH] all right. 3:59 Her we go. 4:03 Winners, look at winners. 4:04 Is Eric Ewer's present? 4:08 No Eric Ewers. 4:11 So, here we go. 4:12 I'm gonna say no and it's gonna continue. 4:14 Summer present? 4:19 Yeah, all right. 4:20 >> [APPLAUSE] >> So I'm gonna say anything. 4:22 I'm gonna say, yep, Summer's here, and what's your t-shirt size? 4:24 >> Small. 4:29 >> Small, okay. 4:30 Path's posse, path post. 4:31 >> Yeah, that's me. 4:36 >> That's you? 4:37 Yeah, all right, so we'll loop here till we hit five. 4:38 All right. 4:43 I'm not actually gonna use this data we're just, 4:48 I was kind of trying to show that we did the. 4:50 Sarah I know her, and she is not here, Sarah. 4:52 >> [LAUGH] >> Is Amy present? 4:57 All right. 4:59 >> [APPLAUSE] >> Ashley. 5:00 >> [APPLAUSE] >> All right, 5:07 Simone Flore? 5:12 No, Simone. 5:16 >> [LAUGH] >> Yeah. 5:17 >> [APPLAUSE] >> There we go. 5:20