Computer scienceProgramming languagesKotlinControl flowExceptionsHow to work with exceptions

Avoiding NPEs. Null safety

Theory

Match operators

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Match the operators and their analogues:

Match the items from left and right columns
bottle ?: 0
bottle?.volume
bottle!!.length
if (bottle != null) bottle else 0
if (bottle == null) throw NullPointerException() else bottle.length
if (bottle == null) null else bottle.volume
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