Kotlin
Kotlin
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kotlin.collections.single

single

kotlin-stdlib / kotlin-collections - single 
fun <T> Iterable<T>.single(): T

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

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

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

inline fun <T> Iterable<T>.single(
    predicate: (T) -> Boolean
): T
inline fun <T> Array<out T>.single(