Programming Tutorial Bits: Kotlin Data Classes
Programming Tutorial Bits: Kotlin Data Classes
In this video we will learn:
How to use data classes in Kotlin.
How to decompile Kotlin code to understand what it provides
What Kotlin improves on from Java with data classes
We will also touch on Nullable and Non-Nullable types and what happens when
we try to call a non Nullable type with null form Java (Oh noes!!!)
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Clarifications:
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Auto Get and Set generation:
If the member is declared with var and is accessible to class users (not
private etc) you have access to setters and getters
If it is declared with "val" this NO SETTERS are generated. "val" is
essentially like declaring "final" in Java the world.
EXPERIMENT AND TRY IT OUT! :)
!! Not-Null assertion operator
I touched a little the not null assertion operator, double exclamation point
"!!" and why you should generally avoid it.
I highly recommend reserving these to only test (not prod) code. This is
typically a code smell that may indicate you need to refactor.
If your application ever encounters null with this operator you will get a
null pointer exception
Failing fast is fine in cases where you never expect null, so there may be
practical production cases for this.
In practice though, you'll prob find yourself sanitizing using
question mark operator and Elvis "?:" (which I will touch on in a later video)
and probably throwing more specific validation exceptions etc.
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Resources:
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Code and exercises from video:
https://github.com/Razzlegames/Kotlin...
Kotlin language reference:
https://kotlinlang.org/docs/reference/
IntelliJ IDE
https://www.jetbrains.com/idea/download/
My current Hardware setup: https://timecubepuzzle.blogspot.com/p...