1 00:00:00,650 --> 00:00:06,380 Right in the last video we took a look at maps which are a new object structure in Essex and I wanted 2 00:00:06,380 --> 00:00:07,950 to take a look at sets. 3 00:00:07,980 --> 00:00:14,570 OK so sets are basically unique values. 4 00:00:14,580 --> 00:00:20,020 It's a list of a set of unique values of any type whether it's primitive or reference. 5 00:00:20,190 --> 00:00:21,690 OK and they're always unique. 6 00:00:21,690 --> 00:00:33,300 So you can't have the same one twice so let me just put in here or say store unique values of any type. 7 00:00:33,300 --> 00:00:33,630 All right. 8 00:00:33,630 --> 00:00:36,920 So we're going to create a variable called Set One. 9 00:00:36,960 --> 00:00:41,310 Set it to a new set. 10 00:00:41,820 --> 00:00:43,860 OK. 11 00:00:44,010 --> 00:00:54,210 Actually it's put parentheses there and we want to add some values or say add values to the set. 12 00:00:54,240 --> 00:01:01,230 And we can do that using the add method so we can say set one Daut add and let's add a number. 13 00:01:01,230 --> 00:01:03,120 So I'll say 100. 14 00:01:03,240 --> 00:01:10,290 All right then we'll do set one dot and let's add a string we'll say a string 15 00:01:13,500 --> 00:01:18,730 is one dot and let's add an object. 16 00:01:18,730 --> 00:01:22,160 So will say name John 17 00:01:26,230 --> 00:01:29,380 to add and we'll do a boolean. 18 00:01:30,310 --> 00:01:34,860 OK so we have all of these different types in our set. 19 00:01:34,870 --> 00:01:36,640 All right so let's console log 20 00:01:40,560 --> 00:01:41,920 set 1. 21 00:01:42,480 --> 00:01:47,960 Ok so you can see that it actually tells us it's a set and it has four different values in it. 22 00:01:48,150 --> 00:01:53,820 And if we look we have our number our string or object and our boolean. 23 00:01:53,820 --> 00:01:55,470 Now if I were to try to add 24 00:01:58,380 --> 00:02:09,420 100 again which is already there and save notice we still only have four four things in the set and 25 00:02:09,420 --> 00:02:11,790 it didn't add it again because it's already there. 26 00:02:11,790 --> 00:02:19,100 So that's that's what's great about sets is that we have to be unique values. 27 00:02:19,140 --> 00:02:19,520 OK. 28 00:02:19,530 --> 00:02:28,530 Now if you don't want to add things this way I'll just leave that you could create a set to set to and 29 00:02:28,530 --> 00:02:32,570 you could say new set and you could pass. 30 00:02:32,580 --> 00:02:39,090 And here basically an array of different things that say one true 31 00:02:41,460 --> 00:02:52,170 string and we could say console log set to and save and you can see we have another set so you can use 32 00:02:52,170 --> 00:02:55,500 this format or this format. 33 00:02:55,500 --> 00:02:59,970 All right we're going to stick to set one for testing and stuff. 34 00:03:00,060 --> 00:03:05,310 Let's see if we can also get the size or the count by saying 35 00:03:09,660 --> 00:03:18,200 Just like with maps we use the Size property so that tells us that this for now we can also check for 36 00:03:18,200 --> 00:03:21,400 values. 37 00:03:22,100 --> 00:03:30,230 So let's say Konsole door log set one and we can use Dot has for this. 38 00:03:30,250 --> 00:03:34,130 So I will say has one hundred and save and we get true. 39 00:03:34,630 --> 00:03:35,950 All right. 40 00:03:36,140 --> 00:03:37,790 Now we could even do 41 00:03:40,670 --> 00:03:48,650 we could even do has and then do an expression that equals 100 like 50 plus 50 and save. 42 00:03:48,650 --> 00:03:50,840 And again we get true. 43 00:03:50,840 --> 00:04:02,180 Now one thing that you may be surprised by is that if we put an object in here and say name John and 44 00:04:02,180 --> 00:04:08,870 say we get false OK if you look up here we do have an object that has named John you can see it even 45 00:04:08,870 --> 00:04:12,010 highlights at the same time it's the exact same characters. 46 00:04:12,050 --> 00:04:19,410 But if you remember back to data types this is a reference object this is not. 47 00:04:19,580 --> 00:04:26,270 This is not a primitive value that's actually stored in in the stack. 48 00:04:26,310 --> 00:04:31,480 Ok it's stored in the heat which which makes it a reference value. 49 00:04:31,490 --> 00:04:41,510 So even if we were to say if we were to copy this right here and say Konsole door log and say this object 50 00:04:42,200 --> 00:04:47,620 is equal to the same exact thing same object and say we're going to get false. 51 00:04:47,690 --> 00:04:53,570 OK because it's not it's just it's it's pointing to a different location in memory. 52 00:04:53,600 --> 00:04:55,220 It's not a primitive type. 53 00:04:55,340 --> 00:04:58,560 Like a number or a string or a boolean. 54 00:04:58,940 --> 00:05:09,860 If we were to say the string hello is equal to the string hello then we get true OK because a string 55 00:05:09,860 --> 00:05:13,000 is a primitive value so hopefully that makes sense. 56 00:05:13,070 --> 00:05:18,600 But that's why we get false when we try when we try to check for this. 57 00:05:18,640 --> 00:05:22,210 All right another thing we can do is delete from the set. 58 00:05:23,690 --> 00:05:38,620 OK so if we say set one dot delete and I'll pass in one hundred and then console log set or set one 59 00:05:38,920 --> 00:05:39,550 and save. 60 00:05:39,550 --> 00:05:42,940 You can see now we only have three in there and 100 is not there. 61 00:05:42,940 --> 00:05:45,890 We can delete it using the delete method. 62 00:05:46,510 --> 00:05:54,280 OK so we can also iterate through sets. 63 00:05:54,590 --> 00:06:00,350 So let's go ahead and say actually let's do a four. 64 00:06:00,560 --> 00:06:03,320 We'll do a 4 of 65 00:06:07,200 --> 00:06:08,180 you know do for us. 66 00:06:08,180 --> 00:06:13,540 So say four and we'll pass in here. 67 00:06:16,310 --> 00:06:20,160 Lead item of set one. 68 00:06:20,240 --> 00:06:20,530 All right. 69 00:06:20,540 --> 00:06:23,050 And then we'll just Konsole dot Warg 70 00:06:25,560 --> 00:06:27,740 item and save. 71 00:06:27,930 --> 00:06:34,700 And this is probably going to confuse you guys because we have so many console logs so let me just comment. 72 00:06:34,780 --> 00:06:35,150 So 73 00:06:38,980 --> 00:06:41,680 so save that and this is what we're getting. 74 00:06:41,680 --> 00:06:47,470 So we're looping through using maybe we're getting a string we're getting the object in the true value 75 00:06:47,770 --> 00:06:50,890 the 100 isn't showing up because we still have this delete. 76 00:06:50,890 --> 00:06:56,000 Here if I get rid of that and save then that 100 is going to show up. 77 00:06:56,600 --> 00:07:03,020 Now sets are not key value pairs they're just single value so we could actually do either. 78 00:07:03,040 --> 00:07:07,390 We could do Daut values like that and we're going to get the same thing. 79 00:07:07,510 --> 00:07:16,330 We can do dog KIIS get the same thing and we can do Daut entries and get the same thing actually entries 80 00:07:16,450 --> 00:07:17,530 is a little different. 81 00:07:17,530 --> 00:07:20,320 We're going to get an array. 82 00:07:20,630 --> 00:07:27,670 Actually I've never done entries so I guess we get an array with two. 83 00:07:27,670 --> 00:07:29,480 So that's kind of strange. 84 00:07:29,740 --> 00:07:35,490 I don't think that you would actually use that in many cases but it is possible. 85 00:07:35,500 --> 00:07:39,170 All right so just get rid of that. 86 00:07:39,850 --> 00:07:43,730 All right so we can also use a For Each loop 87 00:07:48,170 --> 00:07:58,340 ok so if we were to say set one dot for each and pass it a function we could pass in an arrow function 88 00:08:01,550 --> 00:08:13,280 and say value Konsole dot log value and save and you could see it's looping through those values. 89 00:08:13,340 --> 00:08:13,620 All right. 90 00:08:13,630 --> 00:08:19,340 And just with just like with maps we can convert sets into arrays. 91 00:08:23,860 --> 00:08:38,080 So for that let's do current set array and we'll set that to array dog from and set 1 and let's say 92 00:08:38,080 --> 00:08:43,320 console dot log set the array and save. 93 00:08:43,330 --> 00:08:47,190 And now we have an array of the things that are in our set. 94 00:08:47,200 --> 00:08:47,500 All right. 95 00:08:47,500 --> 00:08:53,710 So just another option another object structure that we can use now with iOS 6 plus. 96 00:08:54,010 --> 00:08:58,540 Hopefully this helped you guys out help you understand what a map in a set is. 97 00:08:58,570 --> 00:09:01,860 So that's it guys and I will see you in the next video.