WEBVTT 00:03.530 --> 00:06.890 In previous video, we have talked about arithmetical operators. 00:07.310 --> 00:11.510 Now it's time to consider a different type of operators, which are a comparison. 00:12.660 --> 00:16.200 So what are prison operators and what they are used for? 00:17.070 --> 00:23.520 Component operators are used in logical statements to determine equality or difference between variables 00:23.520 --> 00:28.860 or values, so they are used to test for true or false, which are boolean values. 00:28.860 --> 00:34.860 As you remember in JavaScript, you will meet very frequently these situations where you have to either 00:34.860 --> 00:39.710 make decisions or choose something, compare values to each other and so on. 00:40.320 --> 00:44.490 For that, you should really understand how comparison operators actually work. 00:46.030 --> 00:48.820 All right, let's create variables. 00:51.250 --> 00:55.690 Verbal and B and I sign both of them five. 00:57.040 --> 01:03.670 As you remember from previous videos, equals sign is used to assign the values to variables, it doesn't 01:03.670 --> 01:06.110 mean equality, it just assigns the value. 01:06.670 --> 01:09.160 So it's called as assignment operator. 01:10.330 --> 01:17.050 In order to compare the equality of those variables, we can use double equals operator, which compares 01:17.050 --> 01:19.950 the values, but it doesn't compare the type of the values. 01:20.770 --> 01:25.000 So I will show you now what exactly means I'm going to work in cons.. 01:25.000 --> 01:27.710 For now, you can test your anything you want. 01:27.730 --> 01:32.440 That's why I've told you that Consultive is grateful for JavaScript developers, so. 01:32.440 --> 01:32.800 Right. 01:32.800 --> 01:34.990 A double equals to be. 01:36.660 --> 01:39.360 It's obviously true because the values are the same. 01:40.260 --> 01:45.900 Now let's change the type of one of the values and write it as a string. 01:48.410 --> 01:53.570 It's also true because, as we said, this type of comparison operator doesn't compare the types of 01:53.570 --> 02:00.680 the values and it also cause the types what I mean, in type corrosion, I will show you it's a bit 02:00.680 --> 02:01.170 later. 02:02.360 --> 02:09.320 So using double equals operator seems maybe nice, but it's not actually safe because it may cause unexpected 02:09.320 --> 02:10.300 bugs and errors. 02:10.760 --> 02:18.380 Therefore, we need something else like strict mold and it's triple equals, which compares not only 02:18.380 --> 02:21.190 values but also the types. 02:21.830 --> 02:23.270 Let's prove this right. 02:23.270 --> 02:24.980 A triple equals to be. 02:26.410 --> 02:33.550 You see that it's false because types of the values are different, the data type of variable A is no 02:34.030 --> 02:35.460 and B is a string. 02:36.340 --> 02:43.090 So I recommend you to use a equals comparison operator in practice because it's safer than double equals. 02:43.690 --> 02:44.200 All right. 02:44.530 --> 02:47.410 Let's go ahead and talk about other comparison operators. 02:47.860 --> 02:49.720 Double equals and triple equals. 02:49.720 --> 02:56.080 Operators have opposite ones, not equals and strict not equals, which are written with exclamation 02:56.080 --> 02:56.470 marks. 02:56.920 --> 03:01.730 And they work in the exact same way as the previous ones, but they give us opposite values. 03:02.740 --> 03:11.480 So when A double equals B was true, then A not equals to B is false because it's opposite. 03:12.310 --> 03:15.340 So remember, when double equals gives us for example. 03:15.340 --> 03:18.960 True, they're not equals, gives us false and vice versa. 03:20.100 --> 03:25.380 The same is happening with equals and strict not equals if we write a. 03:26.390 --> 03:28.790 Strict not equals to be. 03:30.350 --> 03:32.000 Then we will get through. 03:34.240 --> 03:41.230 All right, you can find all of these operators, Operator Precedent's table, they have same this number 03:41.410 --> 03:41.890 10. 03:42.920 --> 03:50.480 You can find also other component operators, such as less than less than or equal, greater than and 03:50.480 --> 03:56.510 greater than or equal, although the operators act as simply as you know it from your math class. 03:57.460 --> 04:00.190 They have higher precedence number and it's 11. 04:01.420 --> 04:07.780 As for assignment operator, which is an equal sign, it has the lower precedence number that the comparison 04:07.780 --> 04:09.300 operators and it's three. 04:10.030 --> 04:10.530 All right. 04:10.960 --> 04:16.500 And it's like we have introduced the composite operators, it's one of the important aspect in JavaScript 04:16.510 --> 04:18.040 and in every programming language. 04:18.790 --> 04:21.250 So you should really understand well how they work. 04:22.290 --> 04:28.080 You will see many interesting examples and where things using comparison operators, because we're going 04:28.080 --> 04:31.450 to talk about and discuss what type coercion is in JavaScript. 04:32.130 --> 04:33.120 So let's go ahead.