1 00:00:00,540 --> 00:00:03,570 Let me show you how I'm going to solve this challenge. 2 00:00:03,840 --> 00:00:06,750 There are so many ways to go by this weather. 3 00:00:06,750 --> 00:00:13,380 You can go in a long way or a short way, but by the end, all what we need is that we have achieved 4 00:00:13,380 --> 00:00:14,160 our goal. 5 00:00:14,190 --> 00:00:15,690 That is programming for you. 6 00:00:15,810 --> 00:00:21,090 So let me count down here and now let me read the question step by step. 7 00:00:21,300 --> 00:00:26,380 One Create a function to check if it start with a string. 8 00:00:26,400 --> 00:00:31,200 So the first point, let me know the name of my function. 9 00:00:31,500 --> 00:00:32,250 That is it. 10 00:00:32,250 --> 00:00:37,380 So the name or the name of my function I'm going to use is called Start With. 11 00:00:37,590 --> 00:00:46,590 So I'm going to use normal function, start with and then maybe I can add function to it. 12 00:00:46,620 --> 00:00:49,530 Now here you go and here we go. 13 00:00:49,530 --> 00:00:53,310 So let me comment here and call this one as solution. 14 00:00:54,930 --> 00:00:56,850 So I'm done with the first one. 15 00:00:57,180 --> 00:01:01,500 The second one says that the function should take two arguments. 16 00:01:01,530 --> 00:01:07,020 The first argument is the string, and the second argument is a string to check. 17 00:01:07,110 --> 00:01:14,250 Remember, when we say argument, I always repeat This is a values you pass in or call the function 18 00:01:14,250 --> 00:01:17,340 and the parameters are values you pass into the function. 19 00:01:17,340 --> 00:01:18,900 When is it being called? 20 00:01:19,110 --> 00:01:25,980 So when I when I hear argument, it means and pass in parameters and it first prioritizes what the string. 21 00:01:25,980 --> 00:01:29,520 So I can label this one as my string. 22 00:01:30,030 --> 00:01:36,150 And then the second argument is a string to check so I can give it as a start. 23 00:01:37,380 --> 00:01:38,280 Or check. 24 00:01:38,730 --> 00:01:46,800 So inside the function, first of all, we are going to check if indeed is a string, okay? 25 00:01:46,950 --> 00:01:48,180 If indeed is a string. 26 00:01:48,210 --> 00:01:51,510 If it's not a string, then we can retain that place. 27 00:01:51,510 --> 00:01:52,470 Provide a string. 28 00:01:52,470 --> 00:01:52,970 Right. 29 00:01:52,980 --> 00:01:53,930 So let's see. 30 00:01:53,940 --> 00:01:56,640 Point number three, the function should return. 31 00:01:56,640 --> 00:01:57,300 True. 32 00:01:57,300 --> 00:02:03,510 If the if the string start with the string that we are going to pass in and otherwise false. 33 00:02:03,600 --> 00:02:05,940 So check. 34 00:02:06,790 --> 00:02:09,130 Eve the string. 35 00:02:11,790 --> 00:02:13,350 The string start with. 36 00:02:15,240 --> 00:02:16,260 With a string. 37 00:02:17,580 --> 00:02:19,220 Or indeed is a string. 38 00:02:19,230 --> 00:02:19,710 Perfect. 39 00:02:19,710 --> 00:02:21,330 So here if. 40 00:02:22,110 --> 00:02:26,070 This string I'm going to pass in as my agreement on that. 41 00:02:26,070 --> 00:02:28,290 I have a method called start with. 42 00:02:29,290 --> 00:02:35,290 And it starts with what the texts or the text I want to find inside that that text. 43 00:02:35,290 --> 00:02:42,280 So I'll put that here as starts, meaning my text to search for as my start. 44 00:02:42,700 --> 00:02:47,920 So after that then my carry base is perfect. 45 00:02:47,920 --> 00:02:53,200 So if it is true, then I'm going to return true here as it says. 46 00:02:53,770 --> 00:02:55,450 Return true. 47 00:02:56,990 --> 00:03:03,500 Otherwise, if it doesn't start with this or this one means that string does not start with a certain 48 00:03:03,500 --> 00:03:06,320 text or the agreement we pass in. 49 00:03:06,500 --> 00:03:12,050 So down here I'm going to return or I can provide errors here. 50 00:03:12,320 --> 00:03:19,110 Let's see errors here like that so I can remove the errors and then I can return. 51 00:03:19,130 --> 00:03:21,080 Down here is the same thing. 52 00:03:21,260 --> 00:03:22,520 So start. 53 00:03:22,520 --> 00:03:24,900 Let's say string. 54 00:03:25,010 --> 00:03:26,170 Let me ask a message. 55 00:03:26,180 --> 00:03:28,850 String does not. 56 00:03:29,540 --> 00:03:32,720 Does not start with. 57 00:03:33,380 --> 00:03:34,760 Then I can contact. 58 00:03:34,790 --> 00:03:35,070 Okay. 59 00:03:35,090 --> 00:03:37,250 So I can use the template right here. 60 00:03:37,280 --> 00:03:40,580 Because now we are writing I mean modern JavaScript here. 61 00:03:40,760 --> 00:03:44,000 So here my template right here. 62 00:03:44,060 --> 00:03:46,810 Start with I want to inject dynamic value. 63 00:03:46,820 --> 00:03:48,620 So start. 64 00:03:49,310 --> 00:03:50,510 And that is it. 65 00:03:50,540 --> 00:03:57,070 So lastly, let's call the function down here called Invoke and now start with function. 66 00:03:57,080 --> 00:03:59,900 Then I'll pass in academy. 67 00:04:00,990 --> 00:04:04,260 They don't search for less litter a. 68 00:04:05,060 --> 00:04:11,510 So let me assign the result coming back after cognitive function into a variable called response or 69 00:04:11,510 --> 00:04:12,800 rest or result. 70 00:04:14,000 --> 00:04:20,480 So let me consider that log the resort and let's see where I get undefined while the problem. 71 00:04:21,670 --> 00:04:22,300 Oh, sorry. 72 00:04:22,510 --> 00:04:23,870 Line number two, eight and nine. 73 00:04:23,890 --> 00:04:24,610 I didn't return. 74 00:04:24,610 --> 00:04:24,840 True. 75 00:04:24,880 --> 00:04:25,150 Maybe. 76 00:04:25,150 --> 00:04:26,770 I don't know why it has been removed. 77 00:04:26,770 --> 00:04:26,890 So. 78 00:04:26,890 --> 00:04:27,210 Yeah. 79 00:04:27,220 --> 00:04:28,030 Return true. 80 00:04:28,180 --> 00:04:35,920 The string is this one I pass in here and the one I'm searching for is the stars is this one. 81 00:04:35,920 --> 00:04:39,940 So there is a inside the string I pass in here. 82 00:04:39,970 --> 00:04:41,920 That's why I go through. 83 00:04:42,190 --> 00:04:49,540 So if I pass in, let's say here, I pass in, let's say seven. 84 00:04:50,200 --> 00:04:59,140 We see that I got this message that string does not start with seven, meaning I'm wrong so I can pass 85 00:04:59,140 --> 00:05:02,380 in, let's say Z or let's say Z. 86 00:05:02,620 --> 00:05:11,020 Again, I go the same message that string does not start with Z, meaning our function is working perfectly.