WEBVTT 00:00.560 --> 00:04.900 In this lecture I want to go over my favorite loop before loop. 00:04.950 --> 00:13.710 So we saw in the while loop lecture this example where we count from one to some max number and you 00:13.710 --> 00:15.870 set the max to 10. 00:16.440 --> 00:23.040 Well there's a different loop called the for loop that is very good at counting. 00:23.040 --> 00:29.950 So let's try to do for loop example just a just like the one above. 00:29.970 --> 00:38.060 So you say it equals to 1 eyes less than or equal to Max 00:40.910 --> 00:46.110 and plus plus C. 00:47.750 --> 00:51.650 Current generation is 00:55.990 --> 00:58.240 in. 00:58.420 --> 01:03.640 And if we run this see 1 to 10. 01:03.780 --> 01:06.660 So we print 1 to 10 and that's the while loop. 01:06.660 --> 01:12.540 So this first 9:59 is just the while loop and the next 9:59 is our FOR loop. 01:12.550 --> 01:16.700 So it does the exact same thing as the wild. 01:17.220 --> 01:21.950 So let's unpack this syntax a little bit and trying to understand what's going on. 01:22.410 --> 01:26.240 So we have the four and then we have the parentheses just like normal. 01:26.640 --> 01:35.520 And next we have this thing called in die equals to 1 inside the for loop. 01:35.550 --> 01:40.930 So this is actually where we define our iteration very. 01:41.030 --> 01:47.450 So the iteration variables defined in the four look and this this is defined only once. 01:47.440 --> 01:56.910 It only get created one one time at the very start of the for loop and we can just set it to whatever 01:56.910 --> 01:57.350 we want. 01:57.350 --> 02:01.300 In this case it's 1 and we have a semi-colon. 02:01.300 --> 02:06.300 This is really to delimit the different sections of the form. 02:06.370 --> 02:12.560 So the first section is the creation of our iteration variable just like we did up here. 02:12.910 --> 02:22.420 But actually inside the loop itself and next is just the condition just like we had with the same condition 02:23.290 --> 02:24.190 exact same. 02:24.190 --> 02:29.450 So it's always creation of our iteration variable. 02:29.630 --> 02:35.890 Then we check the the condition to see if it's true or not. 02:37.400 --> 02:40.190 And then skip this for now. 02:41.250 --> 02:43.010 And we're going to go to here. 02:43.020 --> 02:50.860 So we just do all our statements just like normal just like we had in our while loop. 02:51.050 --> 03:01.100 And then at the end at the very end of all the statements in the for loop then we will go and do this 03:01.340 --> 03:05.280 plus plus just like we have here. 03:05.290 --> 03:08.140 So these are really just equivalent. 03:08.410 --> 03:18.070 So we do all the statements and then at the end we do plus plus and then we'll check again for the next 03:18.100 --> 03:22.750 iteration to see if the condition is true or false. 03:22.750 --> 03:32.290 So really this for loop and this while loop are equivalent and you can see that in the output. 03:32.870 --> 03:40.070 So this just another way a nice convenient way remember that programmers really like convenience. 03:40.070 --> 03:48.680 So this is a very convenient way of counting and I know the syntax is a bit strange at first but I think 03:48.680 --> 03:57.810 you'll start learning to love having this for loop instead of doing doing it this way every time. 03:57.830 --> 04:08.860 So one thing to note though is we could use this variable outside of of the Y. 04:09.180 --> 04:19.150 So in fact we declared or defined it really outside of the Waialua but this variable is actually a different 04:19.170 --> 04:24.720 arbitrary variable and the variable only for the for loop. 04:24.790 --> 04:30.310 So we can't use this variable outside of the for loop at all. 04:30.550 --> 04:34.200 So that's just one thing to keep in mind. 04:34.220 --> 04:40.520 So in the next lecture I want to go over some things that can modify the flow of our loops.