1 00:00:02,190 --> 00:00:03,930 Now I got one other note about 2 00:00:03,930 --> 00:00:06,470 the programming languages we're using in the course 3 00:00:06,470 --> 00:00:09,690 and programming languages and Clean Code in general. 4 00:00:09,690 --> 00:00:12,250 In one of the first examples I showed you, 5 00:00:12,250 --> 00:00:14,110 I used Python. 6 00:00:14,110 --> 00:00:16,660 And here I used Python code, 7 00:00:16,660 --> 00:00:20,880 which does not have any explicitly assigned types. 8 00:00:20,880 --> 00:00:22,750 On the other hand, throughout this course, 9 00:00:22,750 --> 00:00:25,780 you will also see examples written with TypeScript. 10 00:00:25,780 --> 00:00:27,370 And for example, here's a version 11 00:00:27,370 --> 00:00:31,720 of that code example I showed before, written in TypeScript. 12 00:00:31,720 --> 00:00:34,370 Now TypeScript is an extension to JavaScript 13 00:00:34,370 --> 00:00:38,350 and as its name suggests the primary thing which it does, 14 00:00:38,350 --> 00:00:41,300 is that it adds types to JavaScript. 15 00:00:41,300 --> 00:00:44,840 To be precise, explicitly typing things 16 00:00:44,840 --> 00:00:47,680 which you normally don't have a JavaScript. 17 00:00:47,680 --> 00:00:49,830 And you can see type assignments here 18 00:00:49,830 --> 00:00:52,630 in the parameter list of this function, 19 00:00:52,630 --> 00:00:56,970 or also for the parameter of DS returned functions. 20 00:00:56,970 --> 00:01:00,650 Now, there are other languages like Java or C Sharp, 21 00:01:00,650 --> 00:01:04,010 which also embrace the concept of types 22 00:01:04,010 --> 00:01:06,250 and which also knows strict typing 23 00:01:06,250 --> 00:01:08,820 and explicit type assignments. 24 00:01:08,820 --> 00:01:11,050 And then there are other languages 25 00:01:11,050 --> 00:01:13,360 which don't care as much like Python, 26 00:01:13,360 --> 00:01:16,470 or which don't know the concept of strong typing, 27 00:01:16,470 --> 00:01:18,900 for example, JavaScript. 28 00:01:18,900 --> 00:01:21,080 Now, you could think that you need types 29 00:01:21,080 --> 00:01:23,710 to write Clean Code, because having 30 00:01:23,710 --> 00:01:26,120 these extra type assignments certainly 31 00:01:26,120 --> 00:01:28,630 also helps with code understandability. 32 00:01:28,630 --> 00:01:31,830 If you have a look at this code snippet here, 33 00:01:31,830 --> 00:01:35,030 it should be quite straightforward to read and understand. 34 00:01:35,030 --> 00:01:38,200 And whilst the types might help a little bit 35 00:01:38,200 --> 00:01:39,970 with reading and understanding, 36 00:01:39,970 --> 00:01:43,420 they primarily help with avoiding errors, 37 00:01:43,420 --> 00:01:45,180 and only in addition to that, 38 00:01:45,180 --> 00:01:47,740 they can also help with readability. 39 00:01:47,740 --> 00:01:50,910 But the main reason for using strong typing 40 00:01:50,910 --> 00:01:53,960 is that they can help prevent errors. 41 00:01:53,960 --> 00:01:56,360 Because I would argue that this code 42 00:01:56,360 --> 00:01:59,080 is equally easy to read and understand, 43 00:01:59,080 --> 00:02:02,370 even though we don't have strong typing here. 44 00:02:02,370 --> 00:02:04,940 So you don't need to use a language 45 00:02:04,940 --> 00:02:08,250 which knows and uses strong typing 46 00:02:08,250 --> 00:02:10,850 and wants explicit type assignments. 47 00:02:10,850 --> 00:02:13,380 You don't need data to write Clean Code. 48 00:02:13,380 --> 00:02:16,130 And throughout this course, you're also going to see a bunch 49 00:02:16,130 --> 00:02:19,060 of examples written in Python and JavaScript, 50 00:02:19,060 --> 00:02:22,040 which don't use explicit type assignments. 51 00:02:22,040 --> 00:02:24,750 So you don't need data to write Clean Code, 52 00:02:24,750 --> 00:02:27,380 it's not a must have and I just wanted 53 00:02:27,380 --> 00:02:29,193 to emphasize this right away.