1 00:00:00,330 --> 00:00:04,620 Let me show you how I'm going to solve this challenge. 2 00:00:04,680 --> 00:00:05,580 Here you go. 3 00:00:05,790 --> 00:00:10,360 So first one is to write a function that takes away. 4 00:00:10,380 --> 00:00:12,780 So let's solve the first one. 5 00:00:12,780 --> 00:00:14,670 So here is my function. 6 00:00:15,030 --> 00:00:20,210 Let me use function expression system around any bigger so that I can see it. 7 00:00:21,440 --> 00:00:21,990 Okay. 8 00:00:22,440 --> 00:00:27,570 So const is going to average. 9 00:00:29,480 --> 00:00:39,200 Numbers or average now is equal to my function and that so this function we take in an array and then 10 00:00:39,200 --> 00:00:41,660 my parenthesis inside. 11 00:00:41,690 --> 00:00:42,560 Let's see. 12 00:00:43,550 --> 00:00:48,190 The function should take an array and return the the average. 13 00:00:48,200 --> 00:00:49,400 So here we go. 14 00:00:49,730 --> 00:00:52,280 So how can we get an average? 15 00:00:52,280 --> 00:01:02,420 For example, if we have these records, let's say we have a ray of let's say four, comma, five, 16 00:01:02,630 --> 00:01:11,030 comma, six, and then come on to, like I said, we're going to add these together, four plus five 17 00:01:11,030 --> 00:01:22,280 plus six plus two over two and over two over 1 to 3 for the number of items present in the array. 18 00:01:23,000 --> 00:01:28,280 So in the record as that's if I do this one, I'm able to get my average. 19 00:01:28,280 --> 00:01:32,600 So how can I or how can you write some code to do something like this one? 20 00:01:32,600 --> 00:01:37,370 Remember, for this addition here we can use reduce. 21 00:01:38,680 --> 00:01:43,520 And to be able to get the total length we can use length method. 22 00:01:43,540 --> 00:01:50,260 So we need reduce method and then the length method to get it done, as simple as that. 23 00:01:50,350 --> 00:01:51,380 So let's see. 24 00:01:51,400 --> 00:01:55,150 So let's start with the first the second one. 25 00:01:56,020 --> 00:01:56,620 Okay. 26 00:01:56,680 --> 00:01:58,210 Yeah, yeah. 27 00:01:58,210 --> 00:02:01,150 That's the function should be taken away and retain the average. 28 00:02:01,150 --> 00:02:06,250 So here I would say calculate the average. 29 00:02:06,730 --> 00:02:07,540 Here we go. 30 00:02:07,990 --> 00:02:09,850 So cost. 31 00:02:10,600 --> 00:02:15,430 I would say the average is equal to the array. 32 00:02:15,430 --> 00:02:18,340 Our pass in dot reduce. 33 00:02:19,470 --> 00:02:23,530 And then inside I'll pass in my callback function. 34 00:02:23,550 --> 00:02:31,140 I have access to my accumulator and my current value as that, remember, because you talk about it 35 00:02:31,140 --> 00:02:36,330 before and now my parentheses, and that's why my initial value is that. 36 00:02:36,330 --> 00:02:38,160 So let me expand this. 37 00:02:39,330 --> 00:02:46,890 So here I'm going to return return the accumulator. 38 00:02:47,670 --> 00:02:48,780 Plus. 39 00:02:49,670 --> 00:02:57,830 The agreement applies the current value, not EU, but when you here are here wherever. 40 00:02:57,830 --> 00:03:01,570 So as current value as that. 41 00:03:01,580 --> 00:03:03,980 So I got it right. 42 00:03:04,100 --> 00:03:06,730 So next is I need to return from this function. 43 00:03:06,740 --> 00:03:08,990 So to return the average I got here. 44 00:03:08,990 --> 00:03:12,770 So let's say return the result. 45 00:03:15,270 --> 00:03:18,060 Results from the function. 46 00:03:19,980 --> 00:03:21,000 So here you go. 47 00:03:21,090 --> 00:03:24,090 Return the average. 48 00:03:24,830 --> 00:03:27,100 And remember, you convert this one. 49 00:03:27,110 --> 00:03:28,640 Okay, I'll show you what I mean here. 50 00:03:28,670 --> 00:03:32,820 So next is let's call it and see how we can solve the next one. 51 00:03:32,900 --> 00:03:33,620 We are done. 52 00:03:33,620 --> 00:03:39,500 We are done with these two, as is this one and this one for the meantime, let's try our code first. 53 00:03:39,500 --> 00:03:45,440 So it comes, let's say answer is equal to our call. 54 00:03:45,470 --> 00:03:50,450 My function is average avg number. 55 00:03:50,480 --> 00:03:53,780 Then I'll pass in any array I think I have. 56 00:03:55,090 --> 00:03:55,890 The amount. 57 00:03:55,900 --> 00:04:00,910 Yeah, let me let me comment out this one because I have the verbal name being declared down here. 58 00:04:01,540 --> 00:04:01,990 Yes. 59 00:04:01,990 --> 00:04:04,290 So I'll pass in an array. 60 00:04:04,300 --> 00:04:06,950 So let's say I'll pass in in line here. 61 00:04:06,970 --> 00:04:10,810 Let's say I have two, three, four, five. 62 00:04:11,200 --> 00:04:13,840 So let's console.log. 63 00:04:13,840 --> 00:04:15,180 Console.log. 64 00:04:15,190 --> 00:04:16,390 The answer. 65 00:04:17,170 --> 00:04:20,649 Now we've got for let's see if we are right. 66 00:04:20,980 --> 00:04:23,530 Two plus three is five. 67 00:04:23,530 --> 00:04:26,710 Plus four is nine plus five is 14. 68 00:04:26,710 --> 00:04:28,030 Now, we got it. 69 00:04:28,660 --> 00:04:32,220 So but the question says we should find the average. 70 00:04:32,230 --> 00:04:40,450 So here in divide this one, divide this one by OC for the meantime, before we do that, what will 71 00:04:40,460 --> 00:04:42,490 the average let's do it manually. 72 00:04:42,670 --> 00:04:50,680 We have to this is 14 right divided by let's say we have two, one, two, three, four. 73 00:04:50,680 --> 00:04:58,960 So 14 here let me have we're going to have 14 over four. 74 00:04:59,440 --> 00:05:01,390 What would be the answer for this one? 75 00:05:01,750 --> 00:05:03,520 Well, let's see. 76 00:05:03,850 --> 00:05:10,240 So next is and divide the number of record here, the number of items in the record. 77 00:05:10,240 --> 00:05:16,270 And I can get it as what this array length which is coming from this. 78 00:05:16,810 --> 00:05:18,400 So this array is this one. 79 00:05:18,400 --> 00:05:25,990 So I can append over, let's say divided by the array dot length. 80 00:05:27,700 --> 00:05:29,380 And that is if I save it. 81 00:05:29,410 --> 00:05:30,400 Let's check the answer. 82 00:05:30,430 --> 00:05:33,580 Now we got 3.5. 83 00:05:34,430 --> 00:05:40,480 You see, the last thing is you should convert it to two decimal places because. 84 00:05:41,140 --> 00:05:42,490 Okay, let's ask maybe more. 85 00:05:42,610 --> 00:05:43,960 Let's see, we have nine. 86 00:05:43,960 --> 00:05:44,930 We have two. 87 00:05:44,950 --> 00:05:45,820 Let's see. 88 00:05:46,120 --> 00:05:50,590 We see that we got some random numbers, but I want to run up to two decimal places. 89 00:05:50,590 --> 00:05:52,990 So we need to use what is called fix. 90 00:05:52,990 --> 00:05:59,100 So on the result here we can use to fix to fix. 91 00:05:59,110 --> 00:06:02,550 Remember the arithmetic we are combining all together. 92 00:06:02,560 --> 00:06:04,390 I'll pass in as two. 93 00:06:04,870 --> 00:06:14,890 So let's say with this one now see that I got 4.12 to 2 decimal places, but it says that we should 94 00:06:14,890 --> 00:06:18,160 return in a format that we don't assign. 95 00:06:18,160 --> 00:06:19,240 So here. 96 00:06:20,120 --> 00:06:25,100 I can remove this one, and now I can inject some temperature here. 97 00:06:25,130 --> 00:06:26,240 Now I say that. 98 00:06:27,200 --> 00:06:30,230 Well, I should add a dollar sign. 99 00:06:30,230 --> 00:06:30,470 Right? 100 00:06:30,470 --> 00:06:33,980 So here I will add my dollar sign like that. 101 00:06:34,190 --> 00:06:36,590 And next is I want to add dynamic value. 102 00:06:36,620 --> 00:06:41,370 Dollar sign sees it now paste the results, then remove the semicolon here. 103 00:06:41,390 --> 00:06:46,160 Let's see now I have $4.17. 104 00:06:46,820 --> 00:06:48,390 That is it, guys. 105 00:06:48,410 --> 00:06:49,430 The next video. 106 00:06:49,910 --> 00:06:50,780 Let's see. 107 00:06:50,780 --> 00:06:52,460 Another coding challenge.