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does abstraction gives extensibility and testability  RSS feed

 
anarkali perera
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i found that the Advantages of abstraction are the hiding of implementation details, component reuse, extensibility, and testability from the internet
but how the abstraction helps to get extensibility and testability?
 
David Newton
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Testability because you can use different implementations of the abstraction. Extensibility for same reason.
 
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