Software Design
Software Design is concerned with how to produce a solution that meets the requirements. Good software design allows us to produce good software that is acceptable, dependable, efficient and maintainable. During design, we figure out how things decompose into smaller problems and then combine back together.
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KISS
KISS: Keep It Simple, Stupid.
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Loose Coupling
Loose Coupling: Minimal dependencies between different parts of code.
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High Cohesion
High Cohesion: Modules consist of elements which belong together. Or otherwise the module appears to do one specific task / focus in one area.
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Design Pattern
A design pattern is a description of a recurring solution for a recurring design problem in a certain context.
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The Law of Demeter
The Law of Demeter
This is a guideline which restricts the interactions between objects. If you adhere to this guideline, you naturally reduce the coupling between modules.
When writing a method, the body of that method may only invoke specific other methods. The law wants that method to only talk to ‘close friends’.
Formally, any method of an object may only invoke methods of the following objects:
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- itself
- arguments to
- attributes of
- objects created by
- global variables has access to
