1 00:00:00,880 --> 00:00:03,880 Let's see how we can update. 2 00:00:05,480 --> 00:00:13,370 Object properties so we can do the same thing using two ways or in two ways. 3 00:00:13,370 --> 00:00:23,360 So let me comment this once that is under the ACT Section Properties and object. 4 00:00:26,100 --> 00:00:28,560 That is accessing properties of an object. 5 00:00:28,560 --> 00:00:31,500 So let me copy this one first and then let me comment out. 6 00:00:31,500 --> 00:00:32,870 Now everything is gone. 7 00:00:32,880 --> 00:00:37,710 So calm down here and let's say I think the current is best month, okay? 8 00:00:37,980 --> 00:00:45,810 Let's say here is here is going to be as updating object properties. 9 00:00:47,150 --> 00:00:51,410 Updating Objet properties. 10 00:00:53,740 --> 00:00:54,460 Yes. 11 00:00:55,340 --> 00:00:55,530 Yeah. 12 00:00:55,640 --> 00:00:57,290 So let me paste my object here. 13 00:00:57,320 --> 00:00:57,930 Good. 14 00:00:57,950 --> 00:01:00,940 We can achieve this logic in two ways. 15 00:01:00,950 --> 00:01:03,830 One is using the dot notation. 16 00:01:04,040 --> 00:01:06,890 So here I will say update. 17 00:01:09,380 --> 00:01:10,310 Update. 18 00:01:12,790 --> 00:01:13,750 The person. 19 00:01:16,170 --> 00:01:16,890 Name. 20 00:01:17,500 --> 00:01:18,080 Okay. 21 00:01:18,300 --> 00:01:22,710 So using the dot notation, let me say here, using the. 22 00:01:25,370 --> 00:01:28,880 The dot notation. 23 00:01:29,210 --> 00:01:29,660 Good. 24 00:01:29,990 --> 00:01:31,100 So here we go. 25 00:01:31,670 --> 00:01:38,450 You take the person and then Dot's name, and then E go to the name. 26 00:01:38,450 --> 00:01:39,360 You want to change? 27 00:01:39,380 --> 00:01:42,620 Let's say change this one to Billy. 28 00:01:44,160 --> 00:01:44,910 That is it. 29 00:01:44,940 --> 00:01:45,860 I've changed. 30 00:01:45,900 --> 00:01:46,530 I'm done. 31 00:01:46,530 --> 00:01:49,920 So if I check for my objects. 32 00:01:50,690 --> 00:01:53,660 My person object inside my console here. 33 00:01:54,020 --> 00:02:01,300 Now let's see that the name is no more John, but instead is Billy because originally it is joined here. 34 00:02:01,310 --> 00:02:05,210 But after updating, I'll change this one to Billy. 35 00:02:05,600 --> 00:02:07,880 I can also change the present age. 36 00:02:08,660 --> 00:02:11,870 So person don't age. 37 00:02:12,890 --> 00:02:15,680 At this point you are 100 years. 38 00:02:16,520 --> 00:02:23,060 So if I check for person, you see that I have what, 100 years instead of 30 years? 39 00:02:23,330 --> 00:02:28,610 So I can also change the person dot hobbies. 40 00:02:29,210 --> 00:02:33,260 Now instead of cooking, I would say you like hiking. 41 00:02:35,980 --> 00:02:39,790 Let's say you like also ski. 42 00:02:40,120 --> 00:02:40,470 Let's see. 43 00:02:40,840 --> 00:02:41,170 Let's see. 44 00:02:41,170 --> 00:02:44,260 Also, like dancing. 45 00:02:45,670 --> 00:02:46,450 Yes. 46 00:02:47,710 --> 00:02:48,680 Now let's see. 47 00:02:48,700 --> 00:02:50,070 Let me check for person. 48 00:02:50,080 --> 00:02:52,620 Now, look at the array we have. 49 00:02:52,630 --> 00:02:53,200 What? 50 00:02:54,130 --> 00:02:55,050 RB or hobbies. 51 00:02:55,060 --> 00:02:56,710 We have hiking and dancing. 52 00:02:56,710 --> 00:02:58,660 Not dancing, but dancing. 53 00:02:58,820 --> 00:02:59,590 Changes one to. 54 00:02:59,620 --> 00:03:00,040 Dancing. 55 00:03:01,030 --> 00:03:01,770 Yes. 56 00:03:01,780 --> 00:03:02,860 Check it out again. 57 00:03:02,890 --> 00:03:07,020 Now I have what I have dancing inside my RV. 58 00:03:07,030 --> 00:03:08,460 How we start. 59 00:03:08,470 --> 00:03:10,420 We have the index zero. 60 00:03:10,420 --> 00:03:14,200 Represent the hiking and add index one is dancing remember. 61 00:03:14,500 --> 00:03:16,510 And the array section of this course. 62 00:03:17,140 --> 00:03:17,680 Perfect. 63 00:03:17,680 --> 00:03:21,550 So now that is it about the updating using the. 64 00:03:23,430 --> 00:03:24,330 Dot notation. 65 00:03:24,330 --> 00:03:26,430 So why is this possible? 66 00:03:26,490 --> 00:03:36,180 Well, it's because the way object is objects are always passed by reference, meaning that whatever 67 00:03:36,180 --> 00:03:42,630 you make changes to the object, it affects the original one because you are referencing to that. 68 00:03:42,810 --> 00:03:43,390 Right. 69 00:03:43,410 --> 00:03:48,540 So behind the scene, we've made a copy of this original array. 70 00:03:48,540 --> 00:03:50,810 And then let me show you something here. 71 00:03:50,820 --> 00:03:53,780 We made a copy of this original array. 72 00:03:53,790 --> 00:03:55,170 Let's see, this is my copy here. 73 00:03:55,170 --> 00:03:57,120 Now, this is my copy here. 74 00:03:57,180 --> 00:04:01,860 And now I want to override the name to, let's say, Billy. 75 00:04:02,740 --> 00:04:10,060 Because I referenced I was going to update the original data that is advance topic about how object 76 00:04:10,060 --> 00:04:12,520 behaved object are passed by reference. 77 00:04:12,520 --> 00:04:17,320 So I'll explain to you some function very soon, but not very soon, let's say in the upcoming section 78 00:04:17,320 --> 00:04:18,250 of this course. 79 00:04:19,089 --> 00:04:21,850 Okay, that is the using the dot notation for you. 80 00:04:21,850 --> 00:04:24,550 What about using the bracket notation. 81 00:04:24,550 --> 00:04:32,200 So here also using the bracket bracket notation. 82 00:04:32,200 --> 00:04:40,150 So let me comment this one out or so the same way you make use of person and then square brackets, 83 00:04:40,180 --> 00:04:42,550 single or double codes each. 84 00:04:42,550 --> 00:04:45,010 Now this one, you are 90 years. 85 00:04:45,010 --> 00:04:45,880 Save it. 86 00:04:45,880 --> 00:04:47,140 Let's check the person. 87 00:04:48,840 --> 00:04:49,560 No. 88 00:04:50,520 --> 00:04:53,310 I have the 90 years also. 89 00:04:54,570 --> 00:05:03,360 So let's say that I did the person hobby square bracket code and let's see hobbies let's say this time 90 00:05:03,360 --> 00:05:07,650 around you don't like cooking, neither dancing. 91 00:05:08,190 --> 00:05:09,420 Let's say this time around. 92 00:05:09,420 --> 00:05:12,840 Let's say you would like coding this by a hobby. 93 00:05:13,680 --> 00:05:16,770 Let's say the person also like outing. 94 00:05:17,970 --> 00:05:18,660 Like going out. 95 00:05:18,660 --> 00:05:19,180 Right. 96 00:05:19,200 --> 00:05:26,520 So if I check the console for that, see that now the. 97 00:05:26,790 --> 00:05:27,270 Oh. 98 00:05:27,990 --> 00:05:29,040 Where I still have. 99 00:05:29,040 --> 00:05:29,700 Oh yeah. 100 00:05:29,700 --> 00:05:38,040 You see I taught is cooking coding out in and then age is 90 years and then they see that the properties 101 00:05:38,040 --> 00:05:46,560 are updated are the one that has been changed because here we are updating what the age and then the 102 00:05:46,560 --> 00:05:47,070 hobbies. 103 00:05:47,070 --> 00:05:52,410 So the name and this merit would be the same we know would not be changed. 104 00:05:52,500 --> 00:05:54,360 That's why we have it as that. 105 00:05:54,750 --> 00:05:56,550 Okay, guys, so that is it about that. 106 00:05:56,580 --> 00:05:58,830 What about let's say that. 107 00:05:58,830 --> 00:05:59,490 Well. 108 00:06:01,140 --> 00:06:05,060 After some time, a user comes into the place. 109 00:06:05,070 --> 00:06:07,500 I don't need my name anymore. 110 00:06:07,530 --> 00:06:17,040 Or based on the based on the business logic of your application can see that well after we decided to 111 00:06:17,040 --> 00:06:19,980 keep track of person's age. 112 00:06:20,070 --> 00:06:22,080 I think age is too personal. 113 00:06:22,080 --> 00:06:22,330 Right? 114 00:06:22,380 --> 00:06:26,430 So let me delete the age after I finish creating my object. 115 00:06:26,520 --> 00:06:28,050 How is it possible? 116 00:06:28,530 --> 00:06:29,220 How is it? 117 00:06:29,230 --> 00:06:29,970 Pass me thinking. 118 00:06:29,970 --> 00:06:35,130 Well, I can come in and remove it from here, but do it programmatically. 119 00:06:35,130 --> 00:06:38,900 So let's see how we can delete properties of an object. 120 00:06:38,990 --> 00:06:40,080 The next video.