Kotlin
Kotlin
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kotlin.collections.count

count

kotlin-stdlib / kotlin-collections - count 
fun <T> Iterable<T>.count(): Int
inline fun <T> Collection<T>.count(): Int

Returns the number of elements in this collection.

inline fun <T> Iterable<T>.count(
    predicate: (T) -> Boolean
): Int
inline fun <T> Array<out T>.count(
    predicate: (T) -> Boolean
): Int
inline fun ByteArray.count(predicate: (Byte) -> Boolean): Int
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