All language subtitles for 013 Verifying Reactivity_en

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,570 --> 00:00:07,470 In this lecture, we're going to learn how to verify if a variable is reactive, the composition API 2 00:00:07,470 --> 00:00:09,690 is meant for very large components. 3 00:00:09,960 --> 00:00:16,170 Somewhere along the line, it's possible to run into errors and error because a variable is no longer 4 00:00:16,170 --> 00:00:16,890 reactive. 5 00:00:17,070 --> 00:00:22,380 If we lose reactivity, our application may not behave as users may expect. 6 00:00:23,010 --> 00:00:29,370 You provide two functions for verifying if a variable is reactive, they can be useful and debugging 7 00:00:29,370 --> 00:00:30,290 an application. 8 00:00:30,600 --> 00:00:31,930 Let's look at both of them. 9 00:00:32,159 --> 00:00:37,950 Currently, I'm in the first project we were working with when learning about the composition API. 10 00:00:38,250 --> 00:00:42,030 Specifically, I have the numbers just file opened. 11 00:00:44,510 --> 00:00:51,650 The View package has two functions called is rough and is reactive, let's include both of them with 12 00:00:51,650 --> 00:00:52,700 the important statement. 13 00:00:55,280 --> 00:01:01,460 The is Reft function can be used for checking if a variable is reactive that was created with the rev 14 00:01:01,460 --> 00:01:08,090 function, whereas the is reactive function will check if a variable is reactive that was created with 15 00:01:08,090 --> 00:01:09,400 the reactive function. 16 00:01:10,070 --> 00:01:15,740 We're going to update the import statement to include the reactive function because we'll need to create 17 00:01:15,740 --> 00:01:19,010 a variable with this function for demonstration purposes. 18 00:01:21,570 --> 00:01:26,580 Next, and he said function will quickly create an object called accounts. 19 00:01:29,180 --> 00:01:32,930 This object will be created with the reactive function we imported. 20 00:01:35,220 --> 00:01:40,110 It'll have two properties called checking and savings with random values. 21 00:01:42,730 --> 00:01:48,490 The reason we're creating this object is because we want to be able to test the is reactive function, 22 00:01:48,920 --> 00:01:52,750 our numbers look function didn't have any reactive variables. 23 00:01:53,140 --> 00:01:57,850 After creating the accounts, Variable will perform a log to the console. 24 00:02:00,610 --> 00:02:07,240 They long will output the return value by the IS Reft function will pass and the NUM variable to the 25 00:02:07,240 --> 00:02:08,350 is Reft function. 26 00:02:10,990 --> 00:02:17,590 Will create another log, but this time will log the return value by the is reactive function with the 27 00:02:17,590 --> 00:02:18,760 accounts variable. 28 00:02:21,400 --> 00:02:25,490 Both lungs should output true, since both variables are reactive. 29 00:02:25,750 --> 00:02:29,550 We didn't change them, so they shouldn't have lost their reactivity. 30 00:02:29,950 --> 00:02:33,400 Let's refresh the page in the browser with the console opened. 31 00:02:36,110 --> 00:02:42,230 Both functions are returning true, this means our variables are reactive, the issue provides both 32 00:02:42,230 --> 00:02:47,710 functions for testing f our code is reactive, it's useful for debugging and application. 33 00:02:48,020 --> 00:02:53,150 If you were to override a reactive variable completely, you will lose that reactivity. 34 00:02:53,750 --> 00:02:59,660 That may happen since we're not using the options API where we may accidentally lose reactivity. 35 00:02:59,930 --> 00:03:03,420 Other than that, these two functions don't have much use. 36 00:03:03,800 --> 00:03:05,960 That wraps it up for these two functions. 37 00:03:06,170 --> 00:03:07,550 I'll see you in the next one. 3918

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