Kotlin List intersect()
Syntax & Examples

Syntax of List.intersect()

The syntax of List.intersect() extension function is:

infix fun <T> Iterable<T>.intersect( other: Iterable<T> ): Set<T>

This intersect() extension function of List returns a set containing all elements that are contained by both this collection and the specified collection.

✐ Examples

1 Example

In this example,

We create a list named list1 containing the strings 'a', 'p', 'p', 'l', 'e'.
We also create another list named list2 containing the strings 'p', 'l'.
We use the intersect function to find the common elements between list1 and list2.
The result, which is a set containing the elements 'p' and 'l', is stored in result.
Finally, we print the value of result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf("a", "p", "p", "l", "e");
    val list2 = listOf("p", "l");
    val result = list1.intersect(list2);
    println(result);
}

Output

[p, l]

2 Example

In this example,

We create a list named list1 containing the integers 10, 20, 30.
We also create another list named list2 containing the integers 20, 30.
We use the intersect function to find the common elements between list1 and list2.
The result, which is a set containing the elements 20 and 30, is stored in result.
Finally, we print the value of result to standard output.

Kotlin Program

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

Output

[20, 30]

3 Example

In this example,

We create a list named list1 containing the strings 'apple', 'banana', 'cherry'.
We also create another list named list2 containing the strings 'banana', 'orange'.
We use the intersect function to find the common elements between list1 and list2.
The result, which is a set containing the element 'banana', is stored in result.
Finally, we print the value of result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf("apple", "banana", "cherry");
    val list2 = listOf("banana", "orange");
    val result = list1.intersect(list2);
    println(result);
}

Output

[banana]

Summary

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