1 00:00:00,330 --> 00:00:05,780 We successfully implemented our Dearborn's function, but you might also get a question how to implement 2 00:00:05,790 --> 00:00:06,780 throttle function. 3 00:00:10,020 --> 00:00:11,820 And actually, they're super similar. 4 00:00:11,970 --> 00:00:17,550 And this is why I have the code from out the bones function because we really need to change like one 5 00:00:17,550 --> 00:00:18,600 percent of the code. 6 00:00:19,020 --> 00:00:24,840 So the idea of throttle function is that it will be executed immediately and just to remind you the 7 00:00:24,840 --> 00:00:28,680 bones function will be executed only after our timeout here. 8 00:00:28,680 --> 00:00:31,110 Throttle function executes it immediately. 9 00:00:31,350 --> 00:00:37,200 But after that, the calling of the function is completely ignored for our timeout, which actually 10 00:00:37,200 --> 00:00:43,020 means if a user is typing something, we can call our function only at the beginning and then every 11 00:00:43,020 --> 00:00:43,590 timeout. 12 00:00:43,590 --> 00:00:45,330 So every two seconds, for example. 13 00:00:45,540 --> 00:00:48,030 And this is exactly the core purpose of throttle. 14 00:00:48,210 --> 00:00:51,270 And to simulate it, we must change our code a little bit. 15 00:00:51,540 --> 00:00:55,440 So here we have our saving, but this is fine here this process change. 16 00:00:55,620 --> 00:00:57,660 But we don't want to use here the bones. 17 00:00:57,660 --> 00:00:59,520 We want to write it with throttle. 18 00:00:59,730 --> 00:01:01,890 So the arguments are exactly the same. 19 00:01:02,100 --> 00:01:04,110 And now here we call process change. 20 00:01:04,110 --> 00:01:09,930 At the beginning, this is totally fine, but now I want to simulate that we're calling it with a timeout. 21 00:01:10,230 --> 00:01:15,630 So here we are, right and set timeout, and we want to call this function process change inside it 22 00:01:15,900 --> 00:01:21,840 after some time, for example, after one second, then I will copy paste this set timeout and run it 23 00:01:21,840 --> 00:01:24,900 after one second and 200 milliseconds. 24 00:01:25,080 --> 00:01:32,010 Now I copy paste it again and I will call this function again after two seconds and 400 milliseconds, 25 00:01:32,340 --> 00:01:34,950 and then I will remove to last process change. 26 00:01:35,250 --> 00:01:41,670 So actually, as you can see here, we put timeout 200 milliseconds, which actually means this function 27 00:01:41,670 --> 00:01:43,200 must be executed immediately. 28 00:01:43,560 --> 00:01:45,360 This timeout will be ignored. 29 00:01:45,600 --> 00:01:48,480 This will be also ignored and done with the last two. 30 00:01:48,480 --> 00:01:55,050 Timeout will call this function because it will happen after this timeout of 200 milliseconds. 31 00:01:55,350 --> 00:02:00,630 Now, first of all, let's change the name of our to bonds to throttle where you get and hear the same 32 00:02:00,630 --> 00:02:02,940 arguments of function and our timeout. 33 00:02:03,150 --> 00:02:09,180 But now here we need not a timer ID, but a Boolean, and this boolean will show us if we can execute 34 00:02:09,180 --> 00:02:10,230 this function again. 35 00:02:10,500 --> 00:02:17,310 This is why not let timeout but lead, for example, is waiting and by default it is false and no here, 36 00:02:17,310 --> 00:02:18,840 but also return a function. 37 00:02:19,030 --> 00:02:25,620 We don't need a clear timeout and actually set timeout is staying here, but we don't need timeout because 38 00:02:25,620 --> 00:02:29,350 actually we will forbid this set timeout within this condition. 39 00:02:29,370 --> 00:02:30,450 So here we can write. 40 00:02:30,450 --> 00:02:34,920 If not is waiting, then we want to call this set timeout. 41 00:02:35,130 --> 00:02:39,330 In other case, we won't call anything in this code will be just ignored. 42 00:02:39,690 --> 00:02:42,690 Also, it is important that we call this function directly. 43 00:02:42,900 --> 00:02:45,240 This is why I want to move it inside out. 44 00:02:45,240 --> 00:02:50,910 If condition and inside that timeout, we simply change our is rate in property to false back. 45 00:02:51,180 --> 00:02:57,120 So as you can see, this line means that at the beginning on the first call, we will call this function. 46 00:02:57,300 --> 00:02:59,940 But after this, we want to set our flag to true. 47 00:03:00,180 --> 00:03:03,150 This is why here were writing is Vaden equals true. 48 00:03:03,510 --> 00:03:09,120 Then we have a set time, for example, two seconds and after two seconds where Satan is waiting to 49 00:03:09,120 --> 00:03:14,850 false, which actually means we can call this function on the after two seconds and not before. 50 00:03:14,940 --> 00:03:18,030 So as you can see, the code is 99 percent the same. 51 00:03:18,270 --> 00:03:23,840 The main idea is that we're building here is wait and flag, and we just allow to accept this function 52 00:03:23,860 --> 00:03:25,320 once in our timeout. 53 00:03:25,350 --> 00:03:26,820 Now let's check if it's working. 54 00:03:26,850 --> 00:03:28,050 I'm reloading the page. 55 00:03:28,050 --> 00:03:34,890 We're getting directly saving input for first time and then we see onlyone save input for second time. 56 00:03:35,040 --> 00:03:37,440 And this is exactly this code process change. 57 00:03:37,590 --> 00:03:44,100 And this last timeout was two seconds and 400 milliseconds because actually here on our first try, 58 00:03:44,100 --> 00:03:46,470 we're going to throttle is waiting is false. 59 00:03:46,470 --> 00:03:48,520 We're going here, we're checking the key. 60 00:03:48,540 --> 00:03:49,440 It is not true. 61 00:03:49,610 --> 00:03:53,580 Then we're calling directly this function and we're setting our flag to true. 62 00:03:53,790 --> 00:03:59,430 And then after our set timeout and then we're changing this weight and back to false and we don't need 63 00:03:59,430 --> 00:04:03,390 here any time already because we never abort our set timeout. 64 00:04:03,510 --> 00:04:08,850 And the next question that you might get, OK, but what is the difference between the bones and throttle? 65 00:04:09,030 --> 00:04:14,760 And there's the other two said, were Colin de Bond's after use a stop to do something and work on and 66 00:04:14,760 --> 00:04:16,590 throttle for us to follow the beginning. 67 00:04:16,710 --> 00:04:19,200 And then after a certain interval of time.