1 00:00:07,940 --> 00:00:09,100 Everybody what's going on. 2 00:00:09,100 --> 00:00:11,270 This is Caleb with Dove's lips dot com. 3 00:00:11,290 --> 00:00:14,860 And in this video you've got yourself a challenge. 4 00:00:14,860 --> 00:00:18,000 We're going to challenge you in your knowledge of transformations. 5 00:00:18,010 --> 00:00:19,300 And let's go headon. 6 00:00:19,330 --> 00:00:20,720 I'll give you your challenge now. 7 00:00:21,010 --> 00:00:28,780 Pull open your X playground right click on Zip create a new playground page and we'll call this Tran's 8 00:00:28,820 --> 00:00:33,820 formations Dasch challenge. 9 00:00:33,840 --> 00:00:36,470 All right go ahead and select all and delete it. 10 00:00:36,490 --> 00:00:38,910 And here are your challenges. 11 00:00:38,930 --> 00:00:39,700 Boom. 12 00:00:40,030 --> 00:00:49,000 So for map your challenge is to create a name capitalize or create an observable containing three names 13 00:00:49,030 --> 00:00:50,320 of type string. 14 00:00:50,410 --> 00:00:54,790 Then use map to capitalize every element. 15 00:00:54,790 --> 00:01:03,370 Subscribe printing each element and then add the observable to the Dispose bag next for a flat map. 16 00:01:03,370 --> 00:01:09,400 Create a variable called car price of type variable holding the cost of a car. 17 00:01:09,400 --> 00:01:16,320 Create a publish subject called Car subject of type variable with a type int. 18 00:01:16,330 --> 00:01:24,320 OK so a variable of type int call flat map on the car subject and cast each element as an observable. 19 00:01:24,380 --> 00:01:32,710 Subscribe and print out each new observable add to the Dispose bag and be sure to call on next to pass 20 00:01:32,710 --> 00:01:35,860 in the car price observable below the subscription. 21 00:01:36,160 --> 00:01:42,710 OK so next filter create a struct called element and give it three properties. 22 00:01:42,880 --> 00:01:50,590 Name of type String abbreviation of type string and periodic number of type int create five instances 23 00:01:50,830 --> 00:01:54,600 of element 4 different elements on the periodic table. 24 00:01:54,880 --> 00:02:02,680 Google the periodic table if you must then create an observable that includes all five element instances. 25 00:02:02,680 --> 00:02:04,130 You create it. 26 00:02:04,230 --> 00:02:10,970 Use filter to filter out any elements whose periodic number is less than 10. 27 00:02:11,000 --> 00:02:18,040 Subscribe and print out all three properties for each element name abbreviation and periodic number. 28 00:02:18,040 --> 00:02:21,160 Then add the subscription to the Dispose bag. 29 00:02:21,490 --> 00:02:23,340 And finally for. 30 00:02:23,590 --> 00:02:30,370 Create two observable instances one called name observable and the other called username observable 31 00:02:30,970 --> 00:02:32,090 using dot of. 32 00:02:32,110 --> 00:02:39,310 At the end of both observables pass three first names of type string into name observable then pass 33 00:02:39,310 --> 00:02:48,160 in 3 user names into user name observable below that create a new observable and using Zip create a 34 00:02:48,160 --> 00:02:50,140 string literal using the values. 35 00:02:50,170 --> 00:02:54,400 Dollar Signs 0 and dollar sign 1 for example like this. 36 00:02:54,430 --> 00:02:59,650 You can use string encapsulation to print the value here and then a colon and then dollar sign one to 37 00:02:59,650 --> 00:03:03,820 print out the username subscribe and in the next closure. 38 00:03:03,820 --> 00:03:07,710 Print out the observable that is created by the zip function. 39 00:03:07,930 --> 00:03:09,060 Add to dispose back. 40 00:03:09,160 --> 00:03:10,990 So there's your challenge. 41 00:03:10,990 --> 00:03:14,850 You're going to use all four of the transformation functions that you learned. 42 00:03:14,980 --> 00:03:18,820 Good luck with this challenge and we'll see in the next section where we're going to start putting our 43 00:03:18,820 --> 00:03:21,260 Ex-White into practice building real apps. 44 00:03:21,290 --> 00:03:22,590 I'll see over there.