kotlin-stdlib/kotlin.sequences/singleOrNull

singleOrNull

fun <T> Sequence<T>.singleOrNull(): T?
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Returns single element, or null if the sequence is empty or has more than one element.

The operation is terminal.

inline fun <T> Sequence<T>.singleOrNull(predicate: (T) -> Boolean): T?
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Returns the single element matching the given predicate, or null if element was not found or more than one element was found.

The operation is terminal.