WEBVTT 00:00:00.000 --> 00:00:01.800 align:middle line:90% 00:00:01.800 --> 00:00:03.330 align:middle line:90% All right, good. 00:00:03.330 --> 00:00:04.710 align:middle line:90% You guys know what wat means? 00:00:04.710 --> 00:00:07.902 align:middle line:90% 00:00:07.902 --> 00:00:09.830 align:middle line:90% Wat. 00:00:09.830 --> 00:00:12.720 align:middle line:90% Exactly, exactly. 00:00:12.720 --> 00:00:15.600 align:middle line:90% Let's talk about Ruby. 00:00:15.600 --> 00:00:20.430 align:middle line:84% In Ruby, if you reference an undefined variable, of course, 00:00:20.430 --> 00:00:22.650 align:middle line:90% it name errors, as you'd expect. 00:00:22.650 --> 00:00:27.360 align:middle line:84% And if you try to assign B to A with them undefined, of course, 00:00:27.360 --> 00:00:29.118 align:middle line:90% it name errors, as you'd expect. 00:00:29.118 --> 00:00:30.660 align:middle line:84% And what happens if you try to assign 00:00:30.660 --> 00:00:32.670 align:middle line:90% A to with A with A undefined? 00:00:32.670 --> 00:00:33.840 align:middle line:90% Nil. 00:00:33.840 --> 00:00:35.160 align:middle line:90% Correct. 00:00:35.160 --> 00:00:37.100 align:middle line:90% Nil. 00:00:37.100 --> 00:00:38.414 align:middle line:90% Wat. 00:00:38.414 --> 00:00:43.500 align:middle line:90% [LAUGHTER] 00:00:43.500 --> 00:00:44.430 align:middle line:90% Let's talk about Ruby. 00:00:44.430 --> 00:00:47.250 align:middle line:90% 00:00:47.250 --> 00:00:49.860 align:middle line:84% Ruby, unlike some other dynamic languages, 00:00:49.860 --> 00:00:52.860 align:middle line:84% does not have bare words, so you cannot just type words and have 00:00:52.860 --> 00:00:54.360 align:middle line:90% strings come out-- 00:00:54.360 --> 00:00:57.690 align:middle line:84% unless you define a particular method missing 00:00:57.690 --> 00:00:59.280 align:middle line:90% that does the right thing. 00:00:59.280 --> 00:01:01.890 align:middle line:84% And then if you type bare words, suddenly, Ruby 00:01:01.890 --> 00:01:03.147 align:middle line:90% supports bare words. 00:01:03.147 --> 00:01:04.980 align:middle line:84% And in fact, it will even support bare words 00:01:04.980 --> 00:01:07.600 align:middle line:90% with bangs in them. 00:01:07.600 --> 00:01:09.300 align:middle line:84% And this is not deserving of wat. 00:01:09.300 --> 00:01:13.460 align:middle line:84% This is actually a result of how awesome Ruby is. 00:01:13.460 --> 00:01:16.570 align:middle line:84% But if you ever actually do this, then wat? 00:01:16.570 --> 00:01:21.780 align:middle line:90% 00:01:21.780 --> 00:01:23.910 align:middle line:90% Let's talk about JavaScript. 00:01:23.910 --> 00:01:27.870 align:middle line:90% 00:01:27.870 --> 00:01:31.300 align:middle line:84% Does anyone know, in JavaScript, what array plus array 00:01:31.300 --> 00:01:32.910 align:middle line:84% is-- well, let me ask you this first. 00:01:32.910 --> 00:01:35.060 align:middle line:84% What should array plus an array be? 00:01:35.060 --> 00:01:36.060 align:middle line:90% Empty array. 00:01:36.060 --> 00:01:36.630 align:middle line:90% Empty array. 00:01:36.630 --> 00:01:38.610 align:middle line:90% I would also accept type error. 00:01:38.610 --> 00:01:40.980 align:middle line:84% That is not what array plus array is. 00:01:40.980 --> 00:01:42.120 align:middle line:90% Wrong. 00:01:42.120 --> 00:01:43.230 align:middle line:90% Wrong. 00:01:43.230 --> 00:01:46.117 align:middle line:84% Array plus array is empty string. 00:01:46.117 --> 00:01:49.530 align:middle line:90% [LAUGHTER] 00:01:49.530 --> 00:01:50.100 align:middle line:90% Obviously. 00:01:50.100 --> 00:01:53.190 align:middle line:84% I think that's obvious to everyone. 00:01:53.190 --> 00:01:54.750 align:middle line:84% Now, what would array plus object be? 00:01:54.750 --> 00:01:56.250 align:middle line:84% This should obviously be type error, 00:01:56.250 --> 00:01:58.890 align:middle line:84% because those are completely disparate types. 00:01:58.890 --> 00:02:00.562 align:middle line:90% Does anyone know what this is? 00:02:00.562 --> 00:02:01.980 align:middle line:90% False. 00:02:01.980 --> 00:02:02.620 align:middle line:90% No. 00:02:02.620 --> 00:02:03.180 align:middle line:90% Close. 00:02:03.180 --> 00:02:04.102 align:middle line:90% No, far away. 00:02:04.102 --> 00:02:04.602 align:middle line:90% Number. 00:02:04.602 --> 00:02:05.102 align:middle line:90% Object. 00:02:05.102 --> 00:02:06.840 align:middle line:90% It's object. 00:02:06.840 --> 00:02:08.100 align:middle line:90% Right, nicely done. 00:02:08.100 --> 00:02:10.365 align:middle line:84% Now, of course, because this is plus-- 00:02:10.365 --> 00:02:13.360 align:middle line:84% so you can flip the operands and the same thing comes out. 00:02:13.360 --> 00:02:14.670 align:middle line:90% So if we do-- 00:02:14.670 --> 00:02:15.170 align:middle line:90% Is that an array of an object? 00:02:15.170 --> 00:02:16.020 align:middle line:90% What? 00:02:16.020 --> 00:02:17.730 align:middle line:90% No, that's just an object. 00:02:17.730 --> 00:02:19.370 align:middle line:84% If you do object plus array, you should 00:02:19.370 --> 00:02:22.140 align:middle line:84% get exactly the same thing-- which, as you can see, you do. 00:02:22.140 --> 00:02:26.750 align:middle line:90% 00:02:26.750 --> 00:02:30.893 align:middle line:84% And finally, the only one of these that's actually true is-- 00:02:30.893 --> 00:02:32.810 align:middle line:84% because you add arrays, you get empty string-- 00:02:32.810 --> 00:02:33.810 align:middle line:90% that doesn't make sense. 00:02:33.810 --> 00:02:36.970 align:middle line:84% But an object plus an object is actually not a number, 00:02:36.970 --> 00:02:42.970 align:middle line:84% technically, so this one's actually right. 00:02:42.970 --> 00:02:44.860 align:middle line:90% And exactly, right? 00:02:44.860 --> 00:02:47.330 align:middle line:84% Like, what is even going on in this lab? 00:02:47.330 --> 00:02:50.450 align:middle line:84% I just-- I don't even understand what 00:02:50.450 --> 00:02:52.317 align:middle line:84% a person with a brain in their head 00:02:52.317 --> 00:02:54.150 align:middle line:84% would think that any of this is a good idea. 00:02:54.150 --> 00:02:57.820 align:middle line:90% 00:02:57.820 --> 00:02:58.612 align:middle line:90% OK, OK. 00:02:58.612 --> 00:03:00.320 align:middle line:84% Enough making fun of languages that suck. 00:03:00.320 --> 00:03:04.220 align:middle line:90% Let's talk about JavaScript. 00:03:04.220 --> 00:03:08.295 align:middle line:84% If I say array.new, 16, or just Array(16), 00:03:08.295 --> 00:03:10.295 align:middle line:84% I get an array of 16 things, which it represents 00:03:10.295 --> 00:03:12.830 align:middle line:90% as 16 commas, which is obvious. 00:03:12.830 --> 00:03:17.450 align:middle line:84% And if I then join those with a string, 00:03:17.450 --> 00:03:19.220 align:middle line:90% then I get this string 16 times. 00:03:19.220 --> 00:03:21.740 align:middle line:84% This is actually the only line in this entire presentation 00:03:21.740 --> 00:03:23.810 align:middle line:90% that's reasonable. 00:03:23.810 --> 00:03:26.000 align:middle line:84% Now, if I take that string and then add a 1 to it, 00:03:26.000 --> 00:03:29.440 align:middle line:90% it casts the 1 to a string. 00:03:29.440 --> 00:03:32.450 align:middle line:84% And then we get wat1 a bunch of times-- fine. 00:03:32.450 --> 00:03:35.180 align:middle line:84% Does anyone know what will happen if I subtract 1 00:03:35.180 --> 00:03:38.150 align:middle line:90% from the string? 00:03:38.150 --> 00:03:39.200 align:middle line:90% I'm assuming no one does. 00:03:39.200 --> 00:03:40.650 align:middle line:90% Let me-- I'll give you a hint. 00:03:40.650 --> 00:03:43.690 align:middle line:90% Does this help? 00:03:43.690 --> 00:03:46.060 align:middle line:90% Does anyone know? 00:03:46.060 --> 00:03:48.510 align:middle line:90% Yes. 00:03:48.510 --> 00:03:52.430 align:middle line:90% [LAUGHTER] 00:03:52.430 --> 00:03:55.360 align:middle line:90% 00:03:55.360 --> 00:03:55.860 align:middle line:90% Watman. 00:03:55.860 --> 00:04:05.180 align:middle line:90% 00:04:05.180 --> 00:04:05.910 align:middle line:90% That's all I got. 00:04:05.910 --> 00:04:07.870 align:middle line:90% Thank you guys. 00:04:07.870 --> 00:04:17.000 align:middle line:90%