1 00:00:02,120 --> 00:00:03,360 Now let's next have a look 2 00:00:03,360 --> 00:00:07,680 at a couple of examples for one-argument functions. 3 00:00:07,680 --> 00:00:10,330 For example here, I have a log function 4 00:00:10,330 --> 00:00:14,530 which simply wraps the built in console log method. 5 00:00:14,530 --> 00:00:16,570 Now we can argue whether such a function 6 00:00:16,570 --> 00:00:19,680 makes too much sense, but we could be doing that, 7 00:00:19,680 --> 00:00:24,320 if we want the option of quickly swapping console log 8 00:00:24,320 --> 00:00:28,020 for some other outputting or logging mechanism. 9 00:00:28,020 --> 00:00:30,570 Then having our own logging function, 10 00:00:30,570 --> 00:00:33,720 which we use for our program, could make sense, 11 00:00:33,720 --> 00:00:36,720 because if we ever switched from console log 12 00:00:36,720 --> 00:00:38,160 to some other mechanism, 13 00:00:38,160 --> 00:00:40,720 we only need to make that switch in one place 14 00:00:40,720 --> 00:00:43,340 instead of in multiple places. 15 00:00:43,340 --> 00:00:47,060 And then we have a function where it makes a lot of sense 16 00:00:47,060 --> 00:00:50,470 that we need one-argument and just one-argument 17 00:00:50,470 --> 00:00:53,510 and that would be the message which should be logged. 18 00:00:53,510 --> 00:00:56,720 Now we could also come up with a way of writing this 19 00:00:56,720 --> 00:00:59,180 such that no arguments are needed 20 00:00:59,180 --> 00:01:00,970 again by creating a class, 21 00:01:00,970 --> 00:01:03,110 which takes the message into constructor 22 00:01:03,110 --> 00:01:06,760 and then has a no parameter log method. 23 00:01:06,760 --> 00:01:10,260 But I'm not to sure whether it is really as an improvement. 24 00:01:10,260 --> 00:01:14,280 It's a lot of extra code and we just replace a function 25 00:01:14,280 --> 00:01:18,880 where it was totally obvious that we might have a parameter 26 00:01:18,880 --> 00:01:22,130 and where the kind and value of that parameter 27 00:01:22,130 --> 00:01:24,650 also is no surprise at all. 28 00:01:24,650 --> 00:01:27,810 So here, I'm absolutely not a fan of changing this 29 00:01:27,810 --> 00:01:29,790 just for the sake of changing it. 30 00:01:29,790 --> 00:01:31,860 Instead, I think the original example 31 00:01:31,860 --> 00:01:34,450 with one-argument here makes a lot of sense 32 00:01:34,450 --> 00:01:37,930 and is absolutely something we can keep around. 33 00:01:37,930 --> 00:01:40,190 Now, here are more functions 34 00:01:40,190 --> 00:01:42,630 where one-argument makes a lot of sense 35 00:01:42,630 --> 00:01:44,790 and is totally obvious. 36 00:01:44,790 --> 00:01:47,150 For example this square function, 37 00:01:47,150 --> 00:01:49,090 which simply squares a number 38 00:01:49,090 --> 00:01:52,740 and therefore for takes that number as a single parameter 39 00:01:52,740 --> 00:01:55,120 or the email is valid function, 40 00:01:55,120 --> 00:01:56,480 which takes the email address, 41 00:01:56,480 --> 00:01:59,690 which should be validated as input. 42 00:01:59,690 --> 00:02:02,640 These are all examples for functions, 43 00:02:02,640 --> 00:02:04,540 which we can leave like that 44 00:02:04,540 --> 00:02:06,210 and where having one-argument 45 00:02:06,210 --> 00:02:08,820 is totally fine, obvious, easy to read 46 00:02:08,820 --> 00:02:10,373 and easy to understand.