Kotlineasy

Explain null safety in Kotlin.

Answer

Kotlin types are non‑null by default. To allow null you mark a type with ?. Safe calls (?.), the Elvis operator (?:), and scope functions like let help handle nullable values without NPEs. !! forces a non‑null assertion and can throw.

val name: String? = null
val length = name?.length ?: 0
println(length)

Related questions

Kotlin

coroutineScope vs supervisorScope: how do they handle failures?

#kotlin#coroutines#supervisor

Kotlin

StateFlow vs SharedFlow: what’s the difference?

#kotlin#stateflow#sharedflow

Kotlin

What does `typealias` do and what doesn’t it do?

#kotlin#typealias#types

Kotlin

Operator overloading: what does `operator` enable and what’s a caveat?

#kotlin#operator#overloading

Kotlin

Delegated properties (`by`): what problem do they solve?

#kotlin#delegation#properties

Kotlin

List vs MutableList in Kotlin: what’s the difference?

#kotlin#collections#immutability