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Explain the concept of the Nothing class in programming.

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Answer from AI

In programming, the class Nothing is usually used to denote the absence of a value or result. In some languages, such as Kotlin, the type Nothing means that a function never returns a value — it either throws an exception or runs infinitely. This helps the compiler understand that after calling such a function, the code will not continue.

Example in Kotlin:

fun fail(message: String): Nothing {
    throw IllegalArgumentException(message)
}

Here, the fail function will never return control to the calling code, so its type is Nothing.

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