single

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

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

The operation is terminal.

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

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

The operation is terminal.