Kotlin List containsAll()
Syntax & Examples

Syntax of List.containsAll()

The syntax of List.containsAll() function is:

abstract fun containsAll(elements: Collection<E>): Boolean

This containsAll() function of List checks if all elements in the specified collection elements are contained in this collection.

✐ Examples

1 Example

In this example,

We create a list named list1 containing the characters 'a', 'p', 'p', 'l', 'e'.
We also create another list named list2 containing the characters 'p', 'l'.
Then we check if list1 contains all elements of list2 using the List containsAll() function.
The result, which is a Boolean value, is stored in result.
Since list1 contains all the elements of the list2, the expression list1.containsAll(list2) returns true.
Finally, we print the value of result to standard output using print statement.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf(&quot;a&quot;, &quot;p&quot;, &quot;p&quot;, &quot;l&quot;, &quot;e&quot;);
    val list2 = listOf(&quot;p&quot;, &quot;l&quot;);
    val result = list1.containsAll(list2);
    print(result);
}

Output

true

2 Example

In this example,

We create a list named list1 containing the integers 10, 20, 30.
We also create a list named list2 containing the integers 20, 30.
Then we check if list1 contains all elements of list2 using the List containsAll() function.
The result, which is a Boolean value, is stored in result.
Since list1 contains all the elements of the list2, the expression list1.containsAll(list2) returns true.
Finally, we print the value of result to standard output using print statement.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf(10, 20, 30);
    val list2 = listOf(20, 30);
    val result = list1.containsAll(list2);
    print(result);
}

Output

true

3 Example

In this example,

We create a list named list1 containing the integers 10, 20, 30.
We also create a list named list2 containing the integers 20, 30.
Then we check if list1 contains all elements of list2 using the List containsAll() function.
The result, which is a Boolean value, is stored in result.
Since list1 does not contain all the elements of the list2, the expression list1.containsAll(list2) returns false.
Finally, we print the value of result to standard output using print statement.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf(10, 20, 30);
    val list2 = listOf(40, 80);
    val result = list1.containsAll(list2);
    print(result);
}

Output

false

Summary

In this Kotlin tutorial, we learned about containsAll() function of List: the syntax and few working examples with output and detailed explanation for each example.