1 00:00:00,090 --> 00:00:01,290 Welcome back. 2 00:00:01,950 --> 00:00:04,600 Let's improve our function a little bit. 3 00:00:04,620 --> 00:00:08,880 Talking about function parameters and function argument. 4 00:00:09,060 --> 00:00:11,720 Okay, so let me comment out. 5 00:00:11,780 --> 00:00:13,410 Maybe in the future we can reference this one. 6 00:00:13,410 --> 00:00:20,220 So let me copy this one, this function, and then come down here and then comment out this function. 7 00:00:20,250 --> 00:00:23,070 And now I have the name of the function here. 8 00:00:23,250 --> 00:00:25,290 So let's talk about function. 9 00:00:25,590 --> 00:00:27,570 I mean, function parameters. 10 00:00:27,570 --> 00:00:29,700 So these are the parameters. 11 00:00:29,730 --> 00:00:32,220 These are the values you pass into the function here. 12 00:00:32,790 --> 00:00:35,850 So what do I pass in here is what you call parameters. 13 00:00:35,850 --> 00:00:37,830 So what are the parameters doing here? 14 00:00:38,190 --> 00:00:47,510 One, this function is not reusable because any time I call the function, it's giving me 28. 15 00:00:47,520 --> 00:00:47,820 Yes. 16 00:00:47,820 --> 00:00:51,180 Adding these two numbers together to give me 28. 17 00:00:51,210 --> 00:00:54,270 Anyway, I call the function is still 28. 18 00:00:54,270 --> 00:00:57,340 So this function is not reusable. 19 00:00:57,360 --> 00:01:00,960 So how can we make this function reusable? 20 00:01:00,990 --> 00:01:05,110 That's why we need parameters and argument. 21 00:01:05,220 --> 00:01:10,890 So now, instead of just passing the values, let me remove everything from this function. 22 00:01:10,890 --> 00:01:13,810 Now to here comes this function. 23 00:01:13,830 --> 00:01:19,800 First of all, before we pass in the parameters, meaning the value passing here, you need to actually 24 00:01:19,800 --> 00:01:20,310 save. 25 00:01:20,980 --> 00:01:24,970 What kind of data you want to pass into this function? 26 00:01:25,690 --> 00:01:30,550 Well, because this function, if I call it, I won't accept two numbers. 27 00:01:30,880 --> 00:01:38,410 So we can name it whereby we can see that this can be number one or and then number two, meaning number 28 00:01:38,410 --> 00:01:40,000 one and number two. 29 00:01:40,030 --> 00:01:48,190 Or we can make it X and Y, meaning this function we take into values called x and Y. 30 00:01:48,890 --> 00:01:49,560 Perfect. 31 00:01:49,580 --> 00:01:55,520 So inside the body, then we can add these parameters. 32 00:01:55,520 --> 00:01:57,530 So this is what you call parameters. 33 00:01:57,590 --> 00:02:00,490 If there is a percentage, the function is called parameters. 34 00:02:00,500 --> 00:02:04,130 So now I can declare a variable. 35 00:02:04,160 --> 00:02:05,960 I can use var or let's. 36 00:02:05,960 --> 00:02:08,479 But like I said, let's stick to lead and cost. 37 00:02:08,900 --> 00:02:14,030 I can see that result is equal to x plus. 38 00:02:15,110 --> 00:02:17,060 Why now? 39 00:02:18,630 --> 00:02:21,930 You see, if I save this one, you see that? 40 00:02:21,930 --> 00:02:24,240 Look at the number of lines we have here. 41 00:02:24,510 --> 00:02:27,060 This one, we have almost one. 42 00:02:27,210 --> 00:02:29,850 One, we have many lines of code here. 43 00:02:29,850 --> 00:02:33,630 We have one, two, three, four, five, six. 44 00:02:33,630 --> 00:02:37,290 And this one we have one, two, three even. 45 00:02:37,290 --> 00:02:38,400 I think we have one here. 46 00:02:38,700 --> 00:02:39,270 Okay. 47 00:02:39,270 --> 00:02:46,740 So to do that, we need to console.log the result as before, we see that we are making the code a bit 48 00:02:46,740 --> 00:02:50,790 cleaner than before improving upon our our function. 49 00:02:50,790 --> 00:02:56,850 If I save this one, we see that I get an A and we have a topic. 50 00:02:56,850 --> 00:03:04,230 Talk about numbers so that we have what is called not a number because we are trying we add X and then 51 00:03:04,230 --> 00:03:08,040 y which doesn't exist for this one. 52 00:03:08,040 --> 00:03:11,190 JavaScript says that, well, these are a number, right? 53 00:03:11,430 --> 00:03:20,640 So one, first of all, we have passed in the the parameters this function receiving two numbers to 54 00:03:20,640 --> 00:03:21,270 add up. 55 00:03:21,540 --> 00:03:25,260 But when you call the function, you are not passing those values. 56 00:03:25,470 --> 00:03:26,910 So look at it here. 57 00:03:26,940 --> 00:03:32,550 So the value you pass into the function when you call it is what you call agreement. 58 00:03:32,550 --> 00:03:35,550 So here we can add any number together. 59 00:03:35,550 --> 00:03:37,470 Let's say two, comma, three. 60 00:03:38,280 --> 00:03:40,290 So here you go. 61 00:03:40,830 --> 00:03:44,880 We see that this function is a is receiving two things. 62 00:03:45,210 --> 00:03:46,890 First, X and Y. 63 00:03:47,650 --> 00:03:53,320 So it means that if you call the function into passing in those values as that. 64 00:03:53,320 --> 00:04:01,440 So here this X represents the first one and the Y represents the second one. 65 00:04:01,450 --> 00:04:03,910 So it is what you call parameters. 66 00:04:04,800 --> 00:04:08,010 And it's what you call the argument. 67 00:04:08,040 --> 00:04:13,440 So if you take that now, X has become two and one has become three. 68 00:04:13,470 --> 00:04:16,320 X is this one and why is this one? 69 00:04:16,649 --> 00:04:25,290 So if I save the function and let's see, it's going to run for us if I save it now I have five. 70 00:04:25,320 --> 00:04:26,490 That is great. 71 00:04:26,490 --> 00:04:32,880 So with function parameters and function argument, this function is now usable. 72 00:04:33,180 --> 00:04:36,150 I can pass anything, any number. 73 00:04:36,150 --> 00:04:36,930 I want to add this. 74 00:04:36,930 --> 00:04:41,190 I want to add 1.4 plus 75 00:04:41,220 --> 00:04:47,010 9.63215324678. 76 00:04:47,670 --> 00:04:51,690 This function will work because now I have two things I passing this and that. 77 00:04:51,690 --> 00:04:55,650 So if I save it now the function is crazy. 78 00:04:55,680 --> 00:04:59,580 And for me it has done the hard work for me without me thinking about it. 79 00:05:00,360 --> 00:05:04,470 So now this function is really usable. 80 00:05:05,490 --> 00:05:06,270 You get it? 81 00:05:06,390 --> 00:05:07,110 That is it. 82 00:05:07,110 --> 00:05:10,730 So you would understand this concept now why not? 83 00:05:10,740 --> 00:05:13,140 We are a way to become a JavaScript developer. 84 00:05:13,710 --> 00:05:21,440 One more left to make complete function creator is what you call the return keyword. 85 00:05:21,450 --> 00:05:22,900 So let's solve that one. 86 00:05:22,920 --> 00:05:26,800 The next video or I'll show you one in the next video. 87 00:05:26,820 --> 00:05:32,400 So before we continue or in this video, let's do this particular assignment here. 88 00:05:32,700 --> 00:05:41,220 So you are of course, your assignment is that create let me make here as exercise C. 89 00:05:42,720 --> 00:05:43,150 Let's see. 90 00:05:43,170 --> 00:05:44,460 One create. 91 00:05:45,510 --> 00:05:47,100 If function. 92 00:05:48,310 --> 00:05:50,650 That will. 93 00:05:52,550 --> 00:05:54,050 Multiply. 94 00:05:55,840 --> 00:05:56,890 Three. 95 00:05:58,080 --> 00:06:00,450 Numbers and. 96 00:06:01,370 --> 00:06:02,510 Display. 97 00:06:03,370 --> 00:06:05,170 The answer. 98 00:06:06,110 --> 00:06:07,160 In the console. 99 00:06:08,510 --> 00:06:11,150 Think about this question and give a try. 100 00:06:11,180 --> 00:06:14,690 The next video, I will show you how and why I saw it. 101 00:06:14,810 --> 00:06:15,230 All right. 102 00:06:15,230 --> 00:06:15,950 Good luck. 103 00:06:15,980 --> 00:06:17,840 To solve this kind of exercise.