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single

fun <T> Sequence<T>.single(): T

Returns the single element, or throws an exception if the sequence is empty or has more than one element.

inline fun <T> Sequence<T>.single(
    predicate: (T) -> Boolean
): T

Returns the single element matching the given predicate, or throws exception if there is no or more than one matching element.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/single.html