WEBVTT 00:01.450 --> 00:06.130 When you write the code almost every time you want to perform different actions for different decisions, 00:06.580 --> 00:10.030 for that we frequently use conditional statement in our code. 00:11.380 --> 00:17.050 Generally, a conditional statement is the part of decision making in JavaScript, the conditional statement 00:17.050 --> 00:22.600 is a statement that will evaluate condition to be either true or false. 00:23.500 --> 00:29.470 As your JavaScript programs get more sophisticated, you will need to make use of conditional statements 00:29.890 --> 00:32.080 that allow your program to make decisions. 00:32.930 --> 00:37.710 Nearly all other programming languages use conditionals, and JavaScript is no exception. 00:38.770 --> 00:43.840 What do we want the block of code to be executed if a specified condition is true or false? 00:44.290 --> 00:50.230 We use if our statement if you take a look on the screen, you will see the general structure of if 00:50.230 --> 00:57.160 statement it starts with if keywords, which is followed by the condition inside the Brace's, the condition 00:57.160 --> 00:58.240 which should be checked. 00:58.240 --> 01:04.900 If it is true or false, then we have the block of code inside the collaborator's and it's executed. 01:04.900 --> 01:10.240 If the condition is true, if it's false, then the code inside the statement will run. 01:10.930 --> 01:18.130 All right, let's go to Brackett's and create the variables my child equals to Alexis. 01:19.660 --> 01:22.420 And then variable gender equals. 01:23.940 --> 01:24.450 To me. 01:27.210 --> 01:31.300 Now, let's use F.L. statements and check the following condition. 01:32.430 --> 01:36.330 So if gender three equals to male. 01:38.540 --> 01:40.980 Then run in council. 01:43.170 --> 01:47.460 My child plus is my son. 01:50.840 --> 01:58.190 And if the condition is false, then in a statement, again, running Castle, my child. 02:00.300 --> 02:02.130 Plus is my daughter. 02:04.800 --> 02:10.440 So in this statement, we have the condition gender triple equal to male, and we need to check if it's 02:10.440 --> 02:15.540 true or false, Alexis can be denied either for male or for female. 02:15.930 --> 02:18.820 And we wonder how the parents should call him or her. 02:19.650 --> 02:21.830 So you see that condition inside the boys. 02:21.850 --> 02:22.470 Is it true? 02:22.470 --> 02:25.360 And therefore, the code in its statement is executed. 02:25.860 --> 02:27.600 We got Alexis is my son. 02:28.470 --> 02:37.380 If we change the gender and write the value as female, then the condition will be false and the block 02:37.380 --> 02:43.370 of code inside each statement will be skipped and the code inside the statement will be executed. 02:44.130 --> 02:46.500 So we have Alexis is my daughter. 02:47.670 --> 02:53.790 If we want to execute code based only on the conditions, true value, then it's not necessary to use 02:53.790 --> 02:57.920 our statement just using if statement is absolutely enough. 02:58.740 --> 03:00.450 So let's get rid of our statement. 03:02.250 --> 03:07.650 You said that the condition is false because of the female value and therefore we don't have result 03:07.650 --> 03:17.220 in council, the block of code inside if escaped, if we change female into male, then we will get 03:17.850 --> 03:18.740 the same result. 03:19.380 --> 03:21.210 Alexis is my son. 03:22.320 --> 03:27.810 Before we finish, I would like to show you something that is very helpful and frequently used, especially 03:27.810 --> 03:31.340 when you deal with a bunch of lines of code, I'm talking about the comments. 03:32.100 --> 03:36.500 They are very useful when you want to either describe the code or post the code. 03:37.020 --> 03:42.800 We have two types of comments, single line and multiline, in order to write a single line comment 03:42.810 --> 03:44.670 we need to use for slashes. 03:45.300 --> 03:50.300 And that the comment you can see that color of code is great. 03:50.730 --> 03:57.120 The text editor makes it different from other working codes and also in JavaScript, Engine says slashes 03:57.630 --> 04:01.800 it understands that this code is commented out and it doesn't executed. 04:02.790 --> 04:06.510 In order to comment multiple lines of code, we can use multiline commenting. 04:06.840 --> 04:12.750 We need to write, slash and start at the beginning of the code and start and slash at the end of the 04:12.750 --> 04:13.100 code. 04:13.920 --> 04:16.520 So you see that whole code is great. 04:17.490 --> 04:21.390 Reload the page and you see that the code is not executed. 04:23.400 --> 04:24.000 All right. 04:24.750 --> 04:29.010 In this lecture, we have talked about conditional statements and commenting. 04:29.190 --> 04:30.060 Let's stop here. 04:30.210 --> 04:31.410 See you in the next video.