Câu hỏi phỏng vấn Kotlin
Câu hỏi

Explain the difference between...

Câu trả lời

Inline classes and type aliases are both features in Kotlin that allow you to work with types, but they have some key differences:

Type Aliases

Type aliases provide an alternative name for an existing type. They are useful for shortening long or verbose type names, such as generic types[4][5]:

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typealias FileTable<K> = MutableMap<K, MutableList<File>>

Here, FileTable is an alias for MutableMap<K, MutableList<File>>. Type aliases do not introduce a new type - they are equivalent to the underlying type[4].

Inline Classes

Inline classes wrap a single value of an underlying type, similar to a type alias. However, inline classes introduce a truly new type, unlike type aliases[1][2].

Inline classes are "inlined" by the compiler, meaning the class is replaced with its underlying value at compile-time. This avoids the overhead of boxing/unboxing and heap allocations[1].

Inline classes can have additional functionality like extension fu...

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