non-nullable

Best explanation for languages without null

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I think the succinct summary of why null is undesirable is that meaningless states should not be representable. Suppose I’m modeling a door. It can be in one of three states: open, shut but unlocked, and shut and locked. Now I could model it along the lines of class Door private bool isShut private bool … Read more

In Kotlin, what is the idiomatic way to deal with nullable values, referencing or converting them

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First, you should read all about Null Safety in Kotlin which covers the cases thoroughly. In Kotlin, you cannot access a nullable value without being sure it is not null (Checking for null in conditions), or asserting that it is surely not null using the !! sure operator, accessing it with a ?. Safe Call, … Read more

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