1 00:00:01,020 --> 00:00:05,880 All right, before we can actually start writing any code, we need to get a development environment 2 00:00:05,880 --> 00:00:10,040 set up and I'm going to walk you through the steps necessary to make this happen. 3 00:00:10,410 --> 00:00:14,010 So the first thing we need to do is to get go and install it. 4 00:00:14,010 --> 00:00:16,020 And it is a really simple process. 5 00:00:16,020 --> 00:00:23,460 So I'm going to fire up a Web browser here and I'm going to go to this site, go langue. 6 00:00:23,580 --> 00:00:25,200 So go to go langue. 7 00:00:25,200 --> 00:00:28,650 And it doesn't matter if you're on Windows or a Mac or Linux. 8 00:00:28,650 --> 00:00:29,850 I happen to be on a Mac. 9 00:00:30,000 --> 00:00:31,680 The process is pretty much the same. 10 00:00:31,710 --> 00:00:34,550 So click on the big button that says download go. 11 00:00:34,590 --> 00:00:39,570 And I'm going to do that because I have an old version of Google installed and I'm on a Mac, so I'm 12 00:00:39,570 --> 00:00:41,400 going to choose Apple Mac OS. 13 00:00:41,400 --> 00:00:42,960 If you run Windows, choose Windows. 14 00:00:42,960 --> 00:00:44,460 If you're on Linux, choose Linux. 15 00:00:44,460 --> 00:00:48,680 If you're feeling really adventurous, I suppose you could install from source and compile it. 16 00:00:48,930 --> 00:00:51,660 I don't recommend that there's no benefit to doing it. 17 00:00:51,660 --> 00:00:55,980 So just click on the one appropriate for your operating system and download it. 18 00:00:56,370 --> 00:01:00,300 So I'm going to open have it open automatically when it downloads. 19 00:01:01,830 --> 00:01:04,680 It's working together and. 20 00:01:06,440 --> 00:01:11,690 It's done so on a market fires south up on a windows, you might have to double click on it, but find 21 00:01:11,690 --> 00:01:12,590 it and install it. 22 00:01:12,590 --> 00:01:16,310 If you already had go installed, you might see previous installation detected. 23 00:01:16,610 --> 00:01:17,510 If you don't, you won't. 24 00:01:17,540 --> 00:01:20,210 So just click through and accept the defaults. 25 00:01:20,630 --> 00:01:27,560 So I'm going to install it and it's trying to install it and I will allow it to do so. 26 00:01:27,560 --> 00:01:28,490 And off it goes. 27 00:01:28,490 --> 00:01:29,990 And it doesn't take long to install. 28 00:01:33,980 --> 00:01:41,210 So there it's all installed and I can verify it's installed by firing up a terminal, which I will do, 29 00:01:41,390 --> 00:01:47,210 I happen to use one called I term, but if you're on Windows, fire up a command prompt and just type 30 00:01:47,210 --> 00:01:49,340 go version. 31 00:01:49,340 --> 00:01:50,000 I think it is. 32 00:01:51,340 --> 00:01:52,930 No, Ashvin. 33 00:01:57,490 --> 00:01:58,180 Go version. 34 00:01:58,660 --> 00:02:01,930 There it is, go version one point fifteen point three. 35 00:02:01,990 --> 00:02:04,430 Now, when you're taking this course, you might be in a later version. 36 00:02:04,570 --> 00:02:07,440 Don't worry, always install the latest version. 37 00:02:08,500 --> 00:02:09,810 So that's simple enough. 38 00:02:09,820 --> 00:02:10,180 Good. 39 00:02:10,750 --> 00:02:18,070 Now let's go and find an integrated development environment and ID and I'm going to show you one that 40 00:02:18,070 --> 00:02:20,310 is free and relatively easy to use. 41 00:02:20,710 --> 00:02:24,490 It's probably not the one I'm going to use in this course, but I'll show you the one I'm using in a 42 00:02:24,490 --> 00:02:24,830 moment. 43 00:02:25,210 --> 00:02:28,500 This one is free, which is why I'm showing you how to install it. 44 00:02:28,510 --> 00:02:36,160 So let's go to Google or your favorite search engine and type in visual studio code. 45 00:02:37,810 --> 00:02:39,070 And it's the first one. 46 00:02:39,070 --> 00:02:40,210 I want to download it. 47 00:02:40,300 --> 00:02:44,790 So let's click on the download link and again, download it for your operating system. 48 00:02:44,800 --> 00:02:46,540 I'm on a Mac, so I'm choosing Mac. 49 00:02:46,540 --> 00:02:48,190 If you're on Linux, you can use this one. 50 00:02:48,190 --> 00:02:49,690 If you're on Windows, you can use this one. 51 00:02:49,690 --> 00:02:58,150 But I'm on a Mac so often comes and I'm going to save the file and I will watch the download. 52 00:02:59,450 --> 00:03:04,880 I sometimes wish I could reclaim the time I spend waiting for computers, I'd have a lot of free time 53 00:03:04,880 --> 00:03:05,630 if I could do that. 54 00:03:11,230 --> 00:03:12,910 And there it is, all downloaded. 55 00:03:12,940 --> 00:03:13,900 Now, we're not finished yet. 56 00:03:13,930 --> 00:03:14,800 We have to set it up. 57 00:03:15,820 --> 00:03:18,340 So I'm going to take the zip file on windows. 58 00:03:18,340 --> 00:03:19,150 You just unzip it. 59 00:03:19,150 --> 00:03:21,540 However, you normally unzip files on a Mac. 60 00:03:21,550 --> 00:03:23,410 I happened to use this one. 61 00:03:24,380 --> 00:03:27,610 The our but again, you can just double click on it and it will extract it. 62 00:03:28,240 --> 00:03:29,330 So it's extracted. 63 00:03:29,470 --> 00:03:32,230 Now I'm going to put that in my applications folder. 64 00:03:32,230 --> 00:03:37,470 So let's find here and find my home. 65 00:03:37,480 --> 00:03:42,370 I guess I want to go to the top level and find applications and I will drag it into my applications 66 00:03:42,370 --> 00:03:42,780 folder. 67 00:03:44,530 --> 00:03:48,730 You can put it wherever you want and start it up. 68 00:03:49,060 --> 00:03:49,960 Let's open it. 69 00:03:51,610 --> 00:03:52,780 Visual studio code. 70 00:03:54,690 --> 00:04:01,320 Yes, I do want you to open this up it comes and we're not quite done, we need to tell it about go. 71 00:04:01,320 --> 00:04:02,420 So I'm going to make this bigger. 72 00:04:03,120 --> 00:04:09,120 I'm going to go to code and preferences and find Extension's. 73 00:04:09,120 --> 00:04:11,460 So find your settings in your extension's. 74 00:04:11,860 --> 00:04:15,030 Open that up and we're going to look for gold. 75 00:04:18,180 --> 00:04:21,120 There it is right there, so let's install this. 76 00:04:23,850 --> 00:04:25,200 And it should be installed. 77 00:04:26,050 --> 00:04:26,610 OK. 78 00:04:28,350 --> 00:04:37,590 And I have to restart, so I'll quit and restart and it becomes SMIC shirts, installed preferences, 79 00:04:37,590 --> 00:04:38,580 extensions. 80 00:04:40,390 --> 00:04:40,990 Go. 81 00:04:42,840 --> 00:04:44,020 There we are, it's installed. 82 00:04:44,040 --> 00:04:46,570 OK, don't go, let's go nightly, go with the go one. 83 00:04:47,040 --> 00:04:51,570 Now, the first time you install this and I had it installed before, so I'm not seeing it, you're 84 00:04:51,570 --> 00:04:55,890 going to see a bunch of alerts show up here in the lower right hand corner asking you to install things, 85 00:04:56,250 --> 00:04:57,390 install those. 86 00:04:57,540 --> 00:05:01,350 OK, so how did this bring this up? 87 00:05:01,800 --> 00:05:03,330 Close that welcome screen. 88 00:05:03,660 --> 00:05:04,620 Now, let's open this up. 89 00:05:04,630 --> 00:05:07,920 I have no open folders, so I'm going to open a folder. 90 00:05:08,910 --> 00:05:11,760 So I'm going to open a folder and I can put this anywhere. 91 00:05:11,760 --> 00:05:20,670 I'll come in here and create a new folder called Visual Studio Projects Create. 92 00:05:21,690 --> 00:05:26,250 Inside of that, I'll create a new folder called Hello World. 93 00:05:26,460 --> 00:05:29,580 You probably saw this company coming up. 94 00:05:29,910 --> 00:05:37,350 The conventional and traditional way of of learning a new language is to create a very simple Hello 95 00:05:37,350 --> 00:05:38,310 World project. 96 00:05:38,310 --> 00:05:39,990 So let's create a new file. 97 00:05:39,990 --> 00:05:41,220 I roll over my folder. 98 00:05:41,220 --> 00:05:45,110 I've just opened in, say, new file, and I'm going to create a file called Main Dot. 99 00:05:45,120 --> 00:05:49,470 Go and Dot Go is the extension you have to give go file. 100 00:05:49,480 --> 00:05:56,220 So I'm creating a new empty file called Mango and I'm going to create a simple program that does nothing 101 00:05:56,220 --> 00:06:00,990 more than write Hello World to the screen and I'll write it to the terminal window. 102 00:06:01,560 --> 00:06:04,440 So let's start with really simple things. 103 00:06:04,440 --> 00:06:07,980 Every file in goal has to have a package. 104 00:06:07,980 --> 00:06:11,370 The first line in your file is going to be a package declaration. 105 00:06:11,370 --> 00:06:15,870 And I'm going to call this main I can call it whatever I wanted, but because this is the main part 106 00:06:15,870 --> 00:06:20,970 of my program and this is a simple program that's going to have one file, I want to give it the name 107 00:06:20,970 --> 00:06:21,330 main. 108 00:06:22,710 --> 00:06:24,870 Underneath that, I'm going to have a function. 109 00:06:24,870 --> 00:06:27,330 And that function is also called main. 110 00:06:27,330 --> 00:06:31,110 And there can only be one main function in an application. 111 00:06:31,560 --> 00:06:35,520 And the way you write functions and go and you're going to get very, very used to this as time goes 112 00:06:35,520 --> 00:06:39,000 on, is with this keyword func that says I'm a funk. 113 00:06:39,000 --> 00:06:44,550 Oh, look, there's the install things, so I'm going to install the first one is go code command is 114 00:06:44,550 --> 00:06:48,840 not available, so let's install and the second one is go packages. 115 00:06:48,840 --> 00:06:51,900 Let's install that and off it goes is installing them. 116 00:06:54,600 --> 00:06:57,450 I'll wait for that to finish all tools successfully installed. 117 00:06:57,450 --> 00:06:58,100 Perfect. 118 00:06:58,590 --> 00:06:59,190 All right. 119 00:06:59,190 --> 00:07:00,150 What's my problem. 120 00:07:00,150 --> 00:07:02,070 Expected package found EAFE. 121 00:07:02,070 --> 00:07:02,430 I know. 122 00:07:03,480 --> 00:07:04,560 So I've got that done. 123 00:07:04,980 --> 00:07:08,040 Let's call this funk main and I'll just get rid of this error message. 124 00:07:08,190 --> 00:07:15,270 It's only there because I wasn't finished typing my function func main and then I have curly brackets 125 00:07:15,270 --> 00:07:16,230 inside of that. 126 00:07:16,530 --> 00:07:20,040 I'm going to do a simple write to the screen and use that. 127 00:07:20,190 --> 00:07:24,420 You do that and go using a package called FMT or format is what I call it. 128 00:07:24,420 --> 00:07:28,380 Some people call it font, but I can't bring myself to say that regularly. 129 00:07:28,380 --> 00:07:32,790 So I call it format FMT Dot. 130 00:07:33,150 --> 00:07:37,230 And this is the nice thing about the ID is it gives me all of the auto completions. 131 00:07:37,450 --> 00:07:40,640 I'm looking for print line Primanti L.N.. 132 00:07:40,680 --> 00:07:43,800 There it is, function of format, print line. 133 00:07:43,800 --> 00:07:47,080 And then inside of that I'll write Hello World. 134 00:07:48,000 --> 00:07:50,580 Now you'll notice that I have an error here. 135 00:07:50,580 --> 00:07:55,890 Still, I'm using this format function but it I need an import statement now. 136 00:07:55,890 --> 00:08:01,590 I could come up here and type in import format, but I really want this to happen automatically. 137 00:08:01,590 --> 00:08:03,300 So I'm going to go to preferences here. 138 00:08:03,300 --> 00:08:10,590 I need to find somewhere and preferences under settings I have go so I type and go. 139 00:08:10,590 --> 00:08:11,220 There it is. 140 00:08:11,820 --> 00:08:15,600 And do I have any code completion stuff. 141 00:08:18,850 --> 00:08:21,520 Um, there's go again, I guess I get out of there. 142 00:08:23,290 --> 00:08:27,220 Build flags, flags to go build no, no. 143 00:08:33,520 --> 00:08:35,980 I'm looking for the. 144 00:08:39,240 --> 00:08:40,410 The auto import. 145 00:08:41,320 --> 00:08:43,390 Where is that footpath? 146 00:08:44,200 --> 00:08:45,430 Watlington PSUV. 147 00:08:50,900 --> 00:08:52,890 Use the language server, that's what I want. 148 00:08:52,940 --> 00:08:54,320 So let's do that. 149 00:08:56,230 --> 00:09:01,060 I don't know, I need to install the go please tools, which is what I want, it installs it. 150 00:09:03,010 --> 00:09:07,450 This is an important step that will save you a lot of time, and I always have to look for it every 151 00:09:07,450 --> 00:09:09,780 time I use this because I don't regularly use this package. 152 00:09:10,660 --> 00:09:12,640 This is OK, I've got it done. 153 00:09:12,820 --> 00:09:15,640 Let's quit out of it just to make sure it's working properly. 154 00:09:15,940 --> 00:09:16,900 Started back up. 155 00:09:19,520 --> 00:09:27,920 And good, let's close the settings, go back to Main, I'm going to delete this line and I'm a FMT 156 00:09:29,150 --> 00:09:34,220 return print line and hopefully it will automatically do the part for me. 157 00:09:34,220 --> 00:09:34,850 And it did. 158 00:09:34,850 --> 00:09:40,200 It put import format in one format, print line and now hello, world. 159 00:09:41,120 --> 00:09:41,720 All right. 160 00:09:42,800 --> 00:09:43,950 So let's save this. 161 00:09:45,140 --> 00:09:45,770 There it is. 162 00:09:46,040 --> 00:09:47,600 My program is now done. 163 00:09:47,870 --> 00:09:49,480 Now I want to run this program. 164 00:09:49,580 --> 00:09:51,200 So I've written a very simple program. 165 00:09:51,200 --> 00:09:52,400 Let's just go through the things. 166 00:09:52,700 --> 00:09:56,930 First of all, every go file has to have a package declaration. 167 00:09:57,290 --> 00:10:01,310 And since we only have one file and it's the main file, the package is main. 168 00:10:01,970 --> 00:10:08,030 The import section tells the code, I am using certain packages and these could be packages in the standard 169 00:10:08,030 --> 00:10:11,090 library, which is all we're going to be using for the next little while. 170 00:10:11,090 --> 00:10:15,890 But eventually we'll go to external packages and then we have at least one function. 171 00:10:15,890 --> 00:10:18,500 And that function, if there's only one, has to be called main. 172 00:10:18,500 --> 00:10:21,020 I can have other functions and we'll do some of those in a little while. 173 00:10:21,020 --> 00:10:22,830 But right now we're just doing a very simple thing. 174 00:10:23,540 --> 00:10:29,810 So how do I run this program, this package main, which uses Fanti format from the standard library 175 00:10:29,960 --> 00:10:33,940 and all it does in the main function is write Hello World to the terminal. 176 00:10:33,980 --> 00:10:38,440 Well, I open a terminal window and in visual studio code you have a built in terminal. 177 00:10:39,050 --> 00:10:39,890 So there it is. 178 00:10:40,460 --> 00:10:43,550 And I'm going to run this now by default. 179 00:10:43,550 --> 00:10:45,860 When I open up the terminal, you can see where I am. 180 00:10:46,010 --> 00:10:52,580 I'm in my users, my name, the visual studio projects folder that I created, and then the Hello world 181 00:10:52,580 --> 00:10:57,710 folder that I created to hold this one file to run this I type. 182 00:10:57,710 --> 00:11:00,110 Go, run, maeng, go. 183 00:11:00,470 --> 00:11:07,600 And when I do that, what should happen is it should print Hello world to the screen and it does. 184 00:11:07,610 --> 00:11:08,360 Hello world. 185 00:11:08,390 --> 00:11:09,090 That's great. 186 00:11:09,140 --> 00:11:12,680 OK, now if I do, unless you see there's only one file in there. 187 00:11:12,710 --> 00:11:15,440 What if I wanted to build an executable. 188 00:11:16,020 --> 00:11:16,910 That's pretty simple. 189 00:11:16,910 --> 00:11:19,730 Go build D'Ascenzo for out. 190 00:11:19,730 --> 00:11:25,020 I want to call it HSW for Low World and what I want to compile is mango. 191 00:11:25,460 --> 00:11:27,350 So go is the command. 192 00:11:27,380 --> 00:11:29,410 You're going to get very used to using the go command. 193 00:11:29,690 --> 00:11:32,540 I want it to build and I want it to output. 194 00:11:32,570 --> 00:11:38,450 That's what the dashboard means to a file called H.W. and I want to compile mango. 195 00:11:38,450 --> 00:11:40,880 And when I do that it looks like nothing happened. 196 00:11:41,060 --> 00:11:47,630 And yet you notice up here I have a new a new file called H.W. And if I do an LS here, I have an H 197 00:11:47,630 --> 00:11:54,680 w and I can run that by doing dot slash, which says run in the current directory H.W. And all that 198 00:11:54,680 --> 00:11:56,330 does is print Hello World. 199 00:11:56,690 --> 00:12:01,250 So that is our basic setup and this is everything you need to use. 200 00:12:01,250 --> 00:12:03,170 This course you may want to install get. 201 00:12:03,170 --> 00:12:04,940 When I get to that I'll talk about that. 202 00:12:05,540 --> 00:12:12,050 But all you need to write go programs is something to create text files. 203 00:12:12,200 --> 00:12:16,910 I like an idea like Visual Studio Code and I'm going to show you the one I'm going to use momentarily. 204 00:12:16,910 --> 00:12:19,640 But Visual Studio Code is free and will do everything you want. 205 00:12:19,880 --> 00:12:27,050 You have to install the go package for Visual Studio Code and you need the go the go programming language. 206 00:12:27,050 --> 00:12:31,350 So once you install go at an idea and the necessary plug ins, you're all set. 207 00:12:32,150 --> 00:12:37,850 Now compare this to something like P, where you have to install a runtime, you have to install all 208 00:12:37,850 --> 00:12:42,950 the packages, you have to have composer, you have to have all kinds of things and keep them up to 209 00:12:42,950 --> 00:12:43,340 date. 210 00:12:43,940 --> 00:12:46,700 All you really need to write go programs is this. 211 00:12:46,820 --> 00:12:50,510 Now, there are other things we're going to use like a database later on and we'll install that. 212 00:12:50,510 --> 00:12:55,100 And it's a very simple process to do it, but it's very, very straightforward and very, very clean 213 00:12:55,100 --> 00:12:55,950 to run go code. 214 00:12:56,180 --> 00:13:01,850 Now, as I said, I don't use visual studio code and if I use it in this course, I'm going to look 215 00:13:01,850 --> 00:13:04,610 like I don't know what I'm doing because I'm just not familiar with it. 216 00:13:04,610 --> 00:13:06,140 ID nor do I want to be. 217 00:13:06,290 --> 00:13:10,460 The one I actually use is by a company called Jet Brains. 218 00:13:11,240 --> 00:13:12,350 But it's commercial software. 219 00:13:12,350 --> 00:13:13,060 You have to buy it. 220 00:13:13,640 --> 00:13:15,710 So I've got a jet Breen's dotcom. 221 00:13:18,540 --> 00:13:23,650 Up it comes, and I want to use go, I want to write, I want to write things in goes. 222 00:13:23,660 --> 00:13:26,920 I'm going to scroll down to find gold and click on that. 223 00:13:27,370 --> 00:13:29,230 And it becomes it says Goaland. 224 00:13:29,230 --> 00:13:31,060 This is exactly the one that I use. 225 00:13:31,060 --> 00:13:33,660 And it's it's just another idy. 226 00:13:33,670 --> 00:13:36,310 The only reason I use it is because I'm familiar with it. 227 00:13:36,550 --> 00:13:41,410 You can get it free if you happen to be a student in an educational institution, you can get it free 228 00:13:41,410 --> 00:13:44,740 if you're using it for an open source project. 229 00:13:44,740 --> 00:13:49,210 But of course you actually have to have a project that is open source that they can look at, or you 230 00:13:49,210 --> 00:13:52,810 can download the three day trial and try it out if you like it by it. 231 00:13:52,810 --> 00:13:56,070 If you don't like it, go back and learn and use visual studio code. 232 00:13:56,080 --> 00:13:57,270 It's entirely up to you. 233 00:13:57,610 --> 00:14:02,920 This is what I'm probably going to use as we go through this course just because I'm so much more familiar 234 00:14:02,920 --> 00:14:03,220 with it. 235 00:14:03,490 --> 00:14:06,340 But the differences really are pretty straightforward. 236 00:14:06,340 --> 00:14:07,930 You're still going to have go files. 237 00:14:07,930 --> 00:14:09,280 You're still going to have a terminal. 238 00:14:09,580 --> 00:14:11,170 Everything will be almost the same. 239 00:14:11,170 --> 00:14:13,570 I'm just going to have a slightly different interface than you are. 240 00:14:13,720 --> 00:14:17,140 But anyway, we've now got a one functional go program. 241 00:14:17,800 --> 00:14:21,220 Let's get started and do something that's actually useful.