kotlin-stdlib/kotlin.collections/containsAll

containsAll

inline fun <T> Collection<T>.containsAll(elements: Collection<T>): Boolean(source)

Checks if all elements in the specified collection are contained in this collection.

Allows to overcome type-safety restriction of containsAll that requires to pass a collection of type Collection<E>.

Since Kotlin

1.1

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val collection = mutableListOf('a', 'b')
val test = listOf('a', 'b', 'c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // false

collection.add('c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // true 
   //sampleEnd
}
inline fun <T> Collection<T>.containsAll(elements: Collection<T>): Boolean(source)

Checks if all elements in the specified collection are contained in this collection.

Allows to overcome type-safety restriction of containsAll that requires to pass a collection of type Collection<E>.

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val collection = mutableListOf('a', 'b')
val test = listOf('a', 'b', 'c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // false

collection.add('c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // true 
   //sampleEnd
}