1 00:00:06,830 --> 00:00:08,060 Welcome back. 2 00:00:08,090 --> 00:00:10,820 In the previous video, this where we left. 3 00:00:11,150 --> 00:00:17,300 So what we are going to do is we are going to work on reinject value here in case our promise fails. 4 00:00:17,320 --> 00:00:19,400 So for this, I mean code. 5 00:00:19,430 --> 00:00:23,390 Our promise has been failed because here is first is false. 6 00:00:23,390 --> 00:00:29,020 Therefore, this function is not going to be called, but this function is will be called. 7 00:00:29,030 --> 00:00:32,299 So how are we going to handle this use case? 8 00:00:32,299 --> 00:00:33,530 And pretty simple. 9 00:00:36,720 --> 00:00:38,570 Because something churning. 10 00:00:38,610 --> 00:00:44,960 Churning simply means that for one object we can use many methods on that object. 11 00:00:44,970 --> 00:00:48,450 Using Dot you can see that this an object, right? 12 00:00:48,450 --> 00:00:51,180 And first we use those then using Dot here. 13 00:00:51,270 --> 00:00:57,060 So apart from this one where we can also change, use dot and catch. 14 00:00:57,390 --> 00:01:01,650 So we catch is submitted that correspond to reject. 15 00:01:01,650 --> 00:01:06,150 So anything that is inside our reject will be found instead of a catch. 16 00:01:06,150 --> 00:01:11,340 When you call it the same way as a function, then pass in one argument. 17 00:01:11,370 --> 00:01:13,340 I'm going to use arrow function for this. 18 00:01:13,350 --> 00:01:14,600 It can be anything. 19 00:01:14,610 --> 00:01:16,760 It can be a normal function or error function. 20 00:01:16,770 --> 00:01:17,510 Perfect. 21 00:01:17,520 --> 00:01:21,120 So the same way we have the value we pass in to this. 22 00:01:21,120 --> 00:01:23,750 So here, well let's just console.log. 23 00:01:23,760 --> 00:01:25,200 Let's say that 24 00:01:27,510 --> 00:01:31,740 something went wrong. 25 00:01:31,770 --> 00:01:35,550 I believe we see this kind of errors most times in most applications. 26 00:01:35,790 --> 00:01:39,690 So if I save it differently, this function will be called here, right? 27 00:01:39,690 --> 00:01:40,800 So save it. 28 00:01:40,800 --> 00:01:41,660 And let's see. 29 00:01:41,670 --> 00:01:47,460 Indeed, something went wrong, meaning that this function is being called. 30 00:01:47,670 --> 00:01:53,340 But the good thing is that instead of us passing in static text here, we want to pass in the error 31 00:01:53,370 --> 00:01:55,440 coming from the server or database. 32 00:01:55,440 --> 00:02:02,450 For the meantime, let's say that error fetching user. 33 00:02:03,450 --> 00:02:06,960 Try again later. 34 00:02:07,390 --> 00:02:07,710 Okay. 35 00:02:07,710 --> 00:02:09,509 So when I save it now let's see. 36 00:02:09,509 --> 00:02:13,230 Presto, I don't get that error here, which is this error. 37 00:02:13,240 --> 00:02:20,280 But instead I only see the console.log inside this because I'm not making use of this the same way we 38 00:02:20,280 --> 00:02:24,050 pass in an argument to the catch called error. 39 00:02:24,060 --> 00:02:26,310 Most times we use error. 40 00:02:26,520 --> 00:02:27,360 Okay. 41 00:02:27,360 --> 00:02:33,680 So it means that the arguments of this one represent the value in my reject. 42 00:02:33,690 --> 00:02:41,350 So here instead of this one I can now console.log dynamic text here or is my error when I save it now. 43 00:02:41,370 --> 00:02:42,480 Error correction user. 44 00:02:42,480 --> 00:02:44,610 Something went wrong. 45 00:02:44,640 --> 00:02:45,860 That is it. 46 00:02:45,870 --> 00:02:52,380 But if I change this one to true, it means that our promise is resolved. 47 00:02:52,410 --> 00:02:54,980 Therefore I'm going to have my user. 48 00:02:54,990 --> 00:03:00,840 So like I said, that a promise return one value whether I resolve or reject. 49 00:03:01,410 --> 00:03:03,600 So that is all what I have for you. 50 00:03:03,600 --> 00:03:04,740 And I promise. 51 00:03:04,740 --> 00:03:07,020 Well, we haven't finished yet. 52 00:03:07,050 --> 00:03:11,490 Remember, we talk about one key point I said I've explained to you. 53 00:03:11,490 --> 00:03:15,060 So let's come back to the fact about promise. 54 00:03:15,090 --> 00:03:20,370 That is, when returning a promise from a function. 55 00:03:21,220 --> 00:03:25,330 The function returned a performance, but not the actual value of the promise. 56 00:03:25,330 --> 00:03:30,220 And then the value of the promise will be retained when the promise is resolved. 57 00:03:30,220 --> 00:03:30,830 Well. 58 00:03:30,850 --> 00:03:36,250 In this case, we are not making use of any function, just using the promise syntax. 59 00:03:36,520 --> 00:03:43,330 So what we are going to do is that the net result is that we are going to create a function with a promise 60 00:03:43,660 --> 00:03:49,600 and then I'm going to see how we can consume that promise using the function. 61 00:03:49,630 --> 00:03:50,560 All right. 62 00:03:50,890 --> 00:03:54,250 So let's get into that in the next video, guys.