filter
inline fun DoubleArray.filter(predicate: (Double) -> Boolean): List<Double>
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inline fun BooleanArray.filter(predicate: (Boolean) -> Boolean): List<Boolean>
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Returns a list containing only elements matching the given predicate.
Samples
import samples.*
import kotlin.test.*
fun main() {
//sampleStart
val numbers: List<Int> = listOf(1, 2, 3, 4, 5, 6, 7)
val evenNumbers = numbers.filter { it % 2 == 0 }
val notMultiplesOf3 = numbers.filterNot { number -> number % 3 == 0 }
assertPrints(evenNumbers, "[2, 4, 6]")
assertPrints(notMultiplesOf3, "[1, 2, 4, 5, 7]")
//sampleEnd
}inline fun UShortArray.filter(predicate: (UShort) -> Boolean): List<UShort>
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Returns a list containing only elements matching the given predicate.
Since Kotlin
1.3
Samples
import samples.*
import kotlin.test.*
fun main() {
//sampleStart
val numbers: List<Int> = listOf(1, 2, 3, 4, 5, 6, 7)
val evenNumbers = numbers.filter { it % 2 == 0 }
val notMultiplesOf3 = numbers.filterNot { number -> number % 3 == 0 }
assertPrints(evenNumbers, "[2, 4, 6]")
assertPrints(notMultiplesOf3, "[1, 2, 4, 5, 7]")
//sampleEnd
}inline fun <K, V> Map<out K, V>.filter(predicate: (Map.Entry<K, V>) -> Boolean): Map<K, V>
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Returns a new map containing all key-value pairs matching the given predicate.
The returned map preserves the entry iteration order of the original map.
Samples
import samples.*
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val originalMap = mapOf("key1" to 1, "key2" to 2, "key3" to 3)
val filteredMap = originalMap.filter { it.value < 2 }
assertPrints(filteredMap, "{key1=1}")
// original map has not changed
assertPrints(originalMap, "{key1=1, key2=2, key3=3}")
val nonMatchingPredicate: ((Map.Entry<String, Int>)) -> Boolean = { it.value == 0 }
val emptyMap = originalMap.filter(nonMatchingPredicate)
assertPrints(emptyMap, "{}")
//sampleEnd
}