04. introduction to frameworks
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The document discusses the challenges a software engineer faced when building their first application without frameworks. They started with a chess game but encountered issues like files becoming too large, bugs being difficult to debug, and having to change code in many files for small changes. They realized applications could become very large with many developers. Frameworks help address these issues by promoting separability, independence, and readability of code. Frameworks provide reusable libraries and structures to build applications without repeating work. This allows developers to focus on game logic rather than rebuilding common structures. The document introduces the MVC framework pattern with descriptions of how the model, view, and controller components work together.
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Ad
04. introduction to frameworks
- 2. Objective I want to be a software engineer
- 3. My first application I dont know any language Well lets choose a language for application programming and start learning.
- 4. after 2 month I have learned programming .. I am good at it and I can build any thing .
- 5. My first application As I can build anything I want to build a chess I am a very good chess player. I know all the rules and I know how to program ... What else do I need
- 6. Week 1
- 7. Week 2
- 8. Week 3
- 9. My first application After three weeks 600 lines of code. Ok its easy. After a month its 3500 lines of code in one file. Certainly I find scroll bar is very useful.
- 10. My first application But when a bug occurs lets debug it. Now it seems building application is not as fun as it ought to be. Now after learning a good lesson well try something different.
- 11. My first application Writing in one file creating problems .. :-? 3686
- 12. My first application Ok I will write small codes in different files
- 13. My first application OMG now I have 100 files and to change some thing I have to change 10 files it is worst than I imagined.
- 14. My first application I think I have found the problem .. This application may be very big and I alone cant complete it. Lets ask a friend.
- 15. My first application Arrrrghhhh. Well we code differently so many misunderstanding it complicates things more
- 16. My first application Lets stop trying and toiling Think, how people writes a code which has millions of lines and thousands of developers How ?????
- 17. My first application Lets see what can be done There is something wrong . What is the problem ?
- 18. Solutions Separability Independence Readablity
- 19. My first application Ok I successfully build a chess game Now I want to build checker or other board games.
- 20. My Next Applications I am so lazy, but I have to handle some things again that I have handled in chess game before. Like, Point Table Player Switching Board status Pieces Save, load, undo, redo etc.
- 21. DRY If I implement them again it will be wastage of time. Don't Repeat Yourself (DRY) Reduce repetition of code of all kinds
- 22. DRY I want to reuse code that I used before in chess game
- 23. DRY The functions need to customize as it was written in chess game i have to change it so that it also work for checker.
- 24. DRY Some times this changes are different because there are so many options and varieties of board games
- 25. DRY If I write those functionalities in a sort of generalized way such that it can be used in all board games. Then I can develop this games very fast without repeating myself.
- 26. DRY Now I can separate the similar codes that I can reuse for these board games. If I need to build checker then I need similar structure as chess game.
- 27. DRY If there is a structure that has similar features for these games then I do not need to start from the beginning. I can straight jump into game logic. logic
- 28. Frameworks The structure that I built to use for all board games can be called framework. A reusable set of libraries or classes for a software system. Used to implement the standard structure of an application.
- 29. Few Frameworks For web application Symfony Zend CodeIgniter CakePHP .NET Django For desktop application Qt C++ WxWidget
- 30. Here is an idea. I am a human why should I repeat another humans work. I haven't coded yet but I need not to because some one has already coded it for others to reuse. There is no point to reinvent the wheel
- 31. MVC
- 32. Model "Represent knowledge" The data/business functionality
- 33. View Visual representation of the model The screens and widgets of app Gets data from model & updates model
- 34. Controller Link between user and system Responsible for intercepting user input Passes user input to view via messages
- 35. Questions?