#49 abstract class and Set default property variable also type data

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1. 1- ‎⁨#1 Dart⁩lang - introduction
2. 2- #2 main structure files and folders project
3. 3- #3 main function to run first code
4. 4- #4 dart core data type String
5. 5- #5 dart core data type int & double
6. 6- #6 dart core datatype bool
7. 7- #7 dart core datatype List
8. 8- #8 dart core data type dynamic
9. 9- #9 dart core override value
10. 10- #10 dart core global variable
11. 11- #11 dart core methods isEmpty & isNotEmpty
12. 12- #12 dart core first & list & length
13. 13- #13 dart core reversed List and convert toList
14. 14- #14 method compare between void and dynamic or data type
15. 15- #15 dart core to string method
16. 16- #16 dart core lower and upper case String
17. 17- #17 dart core trim function
18. 18- #18 dart calculate int values
19. 19- #19 passing value to void or type data or dynamic method
20. 20- #20 dart math get max or min value
21. 21- #21 dart core how to round double value
22. 22- #22 dart core get runtimeType variable
23. 23- #23 for loop
24. 24- #24 forEach
25. 25- #25 List type key and value data
26. 26- #26 constant variables
27. 27- #27 final variable set once
28. 28- #28 what is built in object and methods from dart and how can make same one with as file dart
29. 29- #29 if Conditions if & elseif & else
30. 30- #30 how can make multi conditions in one if conditions and example about and && symbol
31. 31- #31 if short hand Conditions
32. 32- #32 while Loop
33. 33- #33 do while
34. 34- #34 Dead code
35. 35- #35 comment one or multi lines in dart
36. 36- #36 OOP Object oriented object oriented programming introduce
37. 37- #37 how can make Instance Class
38. 38- #38 how can add method to class and use it as object
39. 39- #39 how can make class property variables and use it as object
40. 40- #40 initialize and passing data and override value
41. 41- #41 another way to passing data
42. 42- #42 cascade operation to passing new Value
43. 43- #43 Inheritance class
44. 44- #44 Inheritance methods from main class cmproj
45. 45- #45 Inheritance Level
46. 46- #46 passing data with SuperClass
47. 47- #47 more explanation about super Class
48. 48- #48 override & passing data to extends class
49. 49- #49 abstract class and Set default property variable also type data
50. 50- #50 abstract class and Set default methods also type data
51. 51- #51 use SuperClass and override
52. 52- #52 what is the Implementing
53. 53- #53 implement multiple Interfaces
54. 54- #54 Getter Object
55. 55- #55 Setter Object
56. 56- #56 dart core List Class
57. 57- #57 dart core List fixed length
58. 58- #58 dart core - Map Literal
59. 59- #59 dart core Map Contructor get Values and length and Convert to List
60. 60- #60 dart core Map Functions remove & clear & addAll and Extract data
61. 61- #61 dart core Map data Type
62. 62- #62 dart-io Async with Value stdin
63. 63- #63 dart async Introduce Async - Await
64. 64- #64 how to install package LIKE ( http pkg ) also use this package & dart convert with json data
65. 65- #65 introduction about JSON
66. 66- #66 await more explanation
67. 67- #67 How to declare Constant in Class
68. 68- #68 final vs const in object Class otherwise declare
69. 69- #69 Make Your custom and set Property vars Type In Object Class
70. 70- #70 what is the Duration Class
71. 71- #71 how to use the Duration class in DateTime class
72. 72- #72 Enumeration
73. 73- #73 Switch Case Statement
74. 74- #74 try and catch
75. 75- #75 Finally error message And how to Implement Exception Class
76. 76- #76 dart collection Map VS HashMap
77. 77- #77 dart core List VS Set And HashSet
78. 78- #78 dart collection how to set your data Type in all Instances
79. 79- #79 dart collection LinkedHashMap
80. 80- #80 dart collection SplayTreeMap
81. 81- #81 Factory - how it works in dart - basic explain
82. 82- #82 File Instance How it Work & How to manage files
83. 83- #83 what is the Stream ! & how it works basic explain
84. 84- #84 What is Isolate and how it works? - full example part1
85. 85- #85 Isolate - full example part2
86. 86- #86 for in loop ? Crazy lesson & end of story