WEBVTT 00:00.140 --> 00:00.770 Hi everyone. 00:00.770 --> 00:01.370 Welcome back. 00:01.370 --> 00:06.530 In this lecture we are going to look into one another aspect that is part of the enhanced switch statement. 00:06.530 --> 00:12.230 So in here what we have seen so far is that these are all single line case label body. 00:12.260 --> 00:12.560 Right. 00:12.590 --> 00:14.510 So the body is always single line. 00:14.510 --> 00:20.660 Let's say for some reason you wanted to have some execution of different code statements and then return 00:20.660 --> 00:21.200 a value. 00:21.230 --> 00:23.990 What are the options we have when it comes to enhanced switch. 00:23.990 --> 00:29.600 So in this case what we are going to do, we are going to have this February case label to have some 00:29.630 --> 00:32.720 additional case body and then return this value. 00:32.750 --> 00:33.050 Okay. 00:33.080 --> 00:35.600 So what I'm going to do I'm going to come on this one out. 00:35.630 --> 00:36.200 There we go. 00:36.230 --> 00:37.490 And then what we are going to do. 00:37.520 --> 00:40.340 So we are going to introduce a lambda over here. 00:40.340 --> 00:43.850 So in the lambda we are going to have this open and close parenthesis. 00:43.850 --> 00:48.200 So this is going to have some additional content for this specific case label. 00:48.230 --> 00:51.740 So in this case what I'm going to do I'm going to print the value. 00:51.740 --> 00:54.110 So the value is going to be I'm going to print the month. 00:54.110 --> 00:56.840 So or you can add any logger you want. 00:56.870 --> 01:03.050 So in this case maybe we can add check if here is and you can provide the year over here. 01:03.530 --> 01:07.580 And then we can add is a leap year okay. 01:07.610 --> 01:11.630 So this is to make sure we add some content to the case body. 01:11.630 --> 01:18.320 So that this particular case body becomes a multi statement case body instead of a single line case 01:18.320 --> 01:19.070 body okay. 01:19.100 --> 01:23.060 So in this case what we are going to do I'm going to use the same functionality. 01:23.090 --> 01:23.420 Right. 01:23.450 --> 01:25.490 Our functionality is going to be pretty much the same. 01:25.490 --> 01:30.440 But in order for this enhanced switch to support this kind of case body, what you need to do is you 01:30.440 --> 01:32.360 need to use a new keyword. 01:32.390 --> 01:33.410 It's going to be yield. 01:33.410 --> 01:38.420 So if you use yield, yield is going to make sure it executes this particular statement. 01:38.420 --> 01:41.390 And then what it is going to do it is going to execute this. 01:41.390 --> 01:46.760 And once this is satisfied let's say the case month that's been passed to this specific function is 01:46.790 --> 01:47.420 February. 01:47.420 --> 01:49.670 So in this case it's going to execute this statement. 01:49.670 --> 01:52.820 And then it's going to yield on this specific code statement. 01:52.820 --> 01:56.180 And this is the return value of the specific switch expression. 01:56.180 --> 01:58.880 So let's quickly test this one with the change we have made. 01:58.880 --> 02:00.830 And we have February over here. 02:00.830 --> 02:05.000 So this is to make sure the change that we made is not going to break anything. 02:05.000 --> 02:11.210 So as long as we execute this particular test case and all the test conditions return green, then in 02:11.210 --> 02:13.520 that case, our test case is working as expected. 02:13.520 --> 02:17.270 And also the code change that we made is also working as expected. 02:17.270 --> 02:18.440 So to quickly recap. 02:18.470 --> 02:24.020 So anytime you have a case label which needs to have multiple code statements in it, in those kind 02:24.050 --> 02:29.690 of scenarios, you have to have a lambda with a open and close curly braces, and then you provide whatever 02:29.690 --> 02:32.360 statement you want to execute inside that lambda body. 02:32.360 --> 02:37.340 But the last statement of this specific lambda body is going to be ending with yield. 02:37.340 --> 02:43.310 So in the enhanced switch this is how you code your switch expression where the case block needs to 02:43.340 --> 02:45.590 have multiple code statements in it. 02:45.620 --> 02:50.120 I hope you all have a pretty good idea about how to use yield in our enhanced switch. 02:50.120 --> 02:51.560 This marks the end of this lecture. 02:51.560 --> 02:52.670 Thank you for watching.