1 00:00:00,150 --> 00:00:06,150 All right, so this works, we have our staff function, it is a Synchronoss we're waiting for problems 2 00:00:06,150 --> 00:00:09,930 to resolve and we can see that it is already much cleaner. 3 00:00:10,410 --> 00:00:14,880 How we can set up this code without the wrapping function? 4 00:00:15,450 --> 00:00:22,320 Well, what's really called that in node, there is a module by the name of your Utah and we just go 5 00:00:22,320 --> 00:00:28,980 here, you consed, and we'll sign it to a variable and we'll just be looking for require, of course, 6 00:00:29,310 --> 00:00:31,380 since we would want to import the module. 7 00:00:31,630 --> 00:00:33,930 And again, the name is a utility. 8 00:00:34,680 --> 00:00:41,700 And instead of this module, we have a method by the name of promise, by and with the use of this function 9 00:00:41,940 --> 00:00:48,660 we can take our read file, which of course was looking for a callback and turn it into the function 10 00:00:48,660 --> 00:00:50,550 that returns a promise. 11 00:00:50,820 --> 00:00:54,570 And I got to say is over simplified version, what is happening there. 12 00:00:54,570 --> 00:01:00,180 But hopefully you understand that as a result will get again this promise back. 13 00:01:00,570 --> 00:01:05,820 Now, the way we'll set that up, of course, we have read file here already, so I cannot use the same 14 00:01:05,820 --> 00:01:06,150 name. 15 00:01:06,370 --> 00:01:13,770 That's why I'll go it read file and we'll call this promise from now on is equal to util. 16 00:01:14,160 --> 00:01:15,780 That is of course my module dot. 17 00:01:15,780 --> 00:01:21,910 And then notice the function promise if I and then we pass in that read file function. 18 00:01:22,080 --> 00:01:23,540 So now I have my promise one. 19 00:01:23,850 --> 00:01:28,260 So now what I could do is first of all come into S and moving down. 20 00:01:29,170 --> 00:01:38,500 Again, so it stays for your reference, but it doesn't compromise my view and of course, now have 21 00:01:38,500 --> 00:01:41,850 the error because, well, get taxed is not defined. 22 00:01:42,250 --> 00:01:42,790 That's fine. 23 00:01:42,790 --> 00:01:45,340 Don't worry and I'll copy and paste. 24 00:01:45,340 --> 00:01:54,520 And since I also want to write the new file, I will get from the file system on the right file function, 25 00:01:54,910 --> 00:02:01,780 and I'll do the same thing where in this case it's going to be called write, file, promise, and then 26 00:02:01,780 --> 00:02:03,760 we pass in right file. 27 00:02:04,240 --> 00:02:12,340 And of course now instead of going get tax, what I'm gonna do is go write file or I'm sorry. 28 00:02:12,550 --> 00:02:15,280 In this case we're going for Red File Promise. 29 00:02:15,610 --> 00:02:19,900 And then keep in mind one thing where this is not a get taxed one. 30 00:02:20,140 --> 00:02:24,370 So we're still looking for the path as well as the encoding. 31 00:02:24,530 --> 00:02:25,840 That's why I'll copy and paste. 32 00:02:26,140 --> 00:02:30,100 And then the second argument we pass in is the encoding. 33 00:02:30,400 --> 00:02:37,420 And again, our functionality shouldn't change where I should see in the console the results from the 34 00:02:37,420 --> 00:02:37,930 first. 35 00:02:39,190 --> 00:02:42,790 Now, of course, I would want to do the same thing with the second one. 36 00:02:43,060 --> 00:02:50,530 So I have read file promised second to the again, we have to pass in the encoding, otherwise we'll 37 00:02:50,530 --> 00:02:51,760 get the buffer back. 38 00:02:52,300 --> 00:02:57,940 So copy this paste and again, if we log it, there is we have. 39 00:02:58,060 --> 00:03:05,110 Hello, this is first text file and this is the second one and it's in the line for we passed in right 40 00:03:05,110 --> 00:03:08,380 file into promised fi course. 41 00:03:08,590 --> 00:03:13,330 What we could also do is right away write the file so I can go away. 42 00:03:13,510 --> 00:03:20,620 And I'm simply not assigning this to a variable because well I'm getting back on the finder as far as 43 00:03:20,620 --> 00:03:29,260 data and I'm just going to go with a wait right file promise and the same spiel we passed in First the 44 00:03:29,260 --> 00:03:29,710 path. 45 00:03:30,010 --> 00:03:36,340 And in this case, of course, if the file is not there, node will create one and the name will be 46 00:03:36,370 --> 00:03:37,300 a result. 47 00:03:37,300 --> 00:03:44,060 And I'll just call this mine Granade and then the next day and then the second one is there. 48 00:03:44,260 --> 00:03:50,260 So for the last one, I'll set up my template string and I'll just say, this is awesome. 49 00:03:50,470 --> 00:03:51,100 Awesome. 50 00:03:51,400 --> 00:03:58,630 And then let's set up the colon and then we'll access both first as well as the second one. 51 00:03:58,640 --> 00:04:01,180 So interpolate most of them. 52 00:04:02,110 --> 00:04:09,550 Second, and then once we save, if we take a look at the content, there it is now we have the mind 53 00:04:09,550 --> 00:04:10,900 grenade one, correct. 54 00:04:11,110 --> 00:04:13,690 Now there's probably one where I was testing. 55 00:04:13,990 --> 00:04:14,410 Yep. 56 00:04:14,410 --> 00:04:16,899 There is one where I was testing Salamone this one. 57 00:04:17,200 --> 00:04:22,280 But if I take a look at it one and of course I'll have this is awesome. 58 00:04:22,300 --> 00:04:22,780 Hello. 59 00:04:23,020 --> 00:04:26,670 This is first text file and then I have the second one. 60 00:04:26,980 --> 00:04:32,540 Now what's even more cool that technically we can even skip this part as well? 61 00:04:32,560 --> 00:04:35,470 Again, I'll leave this one for your reference. 62 00:04:36,010 --> 00:04:44,710 But if you go to require, um, and you require, of course, filesystem module, but if you add dot 63 00:04:44,710 --> 00:04:47,530 promises, what do you think is going to return? 64 00:04:47,950 --> 00:04:49,550 Well, effectively the same thing. 65 00:04:49,870 --> 00:04:56,860 So now of course I just need to change the name from read file promise and write a promise back to read 66 00:04:56,860 --> 00:05:03,550 file and write file, since those are the two functions that I'm importing and they will write away 67 00:05:03,550 --> 00:05:04,920 way return promises. 68 00:05:04,930 --> 00:05:10,160 And again, we save and remember that by default we're just overwriting stuff. 69 00:05:10,480 --> 00:05:19,600 So if I were to go and add a third argument, my options one and if I'm just going to say flag and I'll 70 00:05:19,600 --> 00:05:24,070 set it equal to upend once we save one, now we have. 71 00:05:24,340 --> 00:05:25,260 This is awesome. 72 00:05:25,420 --> 00:05:31,120 Repeat it one more time again just to showcase that our functionality still works. 73 00:05:31,750 --> 00:05:40,240 I fully understand that there was a little detour where we created our own wrapper function and we covered 74 00:05:40,480 --> 00:05:43,030 how we would consume promises. 75 00:05:43,360 --> 00:05:48,910 But hopefully this helps you understand that this approach is definitely way better. 76 00:05:49,390 --> 00:05:51,040 So it is more readable. 77 00:05:51,340 --> 00:05:54,880 It is more easier to wrap your head around. 78 00:05:55,180 --> 00:06:00,130 And that's why for the remainder of the course we'll stick with this one again. 79 00:06:00,370 --> 00:06:04,060 Some things will be provided to us by default. 80 00:06:04,180 --> 00:06:07,180 So libraries will provide the functions that return. 81 00:06:07,180 --> 00:06:13,090 Promises will right away have the callback functions that we'll just set up as async and hopefully you 82 00:06:13,090 --> 00:06:13,720 get the gist. 83 00:06:14,020 --> 00:06:20,680 So a lot of things will be given to us, but the core functionality won't change where instead of using 84 00:06:20,680 --> 00:06:27,700 callbacks and testing them instead of the other callbacks and nothing more and more and more, we will 85 00:06:27,700 --> 00:06:36,520 set up everything with async away because the syntax error is cleaner and we're easier to read.