Code: from Procedural to Object Oriented

Code: from Procedural to
Object Oriented
Ron Klein
http://heblog.ronklein.co.il
http://tinyurl.com/ronklein

What is procedural code?
 Program flow is focused on methods
 Methods are also..
 Functions
 Sub (VB notation)
 Procedures
 Public methods must get all their needed parameters:
 Mostly by arguments
 Sometimes as configuration

 Demo...

What is procedural code?
 Implementation details are exposed to programmers
 Example: Fetching data from an external resource:
 Transport: HTTP? FTP? POP3?
 Username, password?

What is OOP code?
 Program flow is focused on interfaces and events
 Implementation details are hidden from the programmer
 Changing the implementation is (or should be) easy
 The hard part: Modeling
 Demo...

Procedural Code Indicators
 Static methods
 Singletons
 Code heavily relies on configuration

OOP – The Good
 Maintainability
 Testability
 Programmers focus on interfaces and not on implementation
 Program flow is clear
 Loose coupling

OOP – The Bad
 Over engineering
 Lots of files
 We might end up with nano services
 Modeling might be hard, or difficult to change
 We sometimes need for an architect or seniors

Is this OOP?
 In general – yes
 C# is a static language..
 .. and so is Java..
 We get class oriented programming:
 Lots of classes to handle

Code: from Procedural to Object Oriented

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