filter

Returns a list containing only elements matching the given predicate.

inline fun <T> Array<out T>.filter(predicate: (T) -> Boolean): List<T>(source)

val numbers = arrayOf(1, 2, 3, 4, 5, 6)
val evens = numbers.filter { it % 2 == 0 }
println(evens)   // Output: [2, 4, 6]

Source