How to use the ArrayDeque.removeAll method in Kotlin
Overview
In Kotlin, the removeAll method removes all the elements of ArrayDeque contained in the passed Collection.
Syntax
The syntax of the method is given below:
fun removeAll(elements: Collection): Boolean
Arguments
This method takes a Collection of elements to be removed from this deque.
Return value
This method returns true if any one of the elements is removed from the deque. Otherwise, it returns false.
Code
The following code demonstrates the use of the removeAll method:
fun main() {
//create a new ArrayDeque which can have integer type as elements
var deque: ArrayDeque<Int> = ArrayDeque<Int>()
// add four entries
deque.add(1)
deque.add(2)
deque.add(3)
deque.add(4)
println("\nThe deque is : $deque")
val list1 = listOf(1,4);
println("\nThe list1 is : $list1")
// remove all the elements of list1 from deque
println("deque.removeAll(list1) : " + deque.removeAll(list1));
println("The deque is : $deque")
val list2 = listOf(5, 10);
println("\nThe list2 is : $list2")
// remove all the elements of list2 from deque
println("deque.removeAll(list2) : " + deque.removeAll(list2));
println("The deque is : $deque")
}Explanation
-
Line 3: We create a new
ArrayDequeobject nameddeque. -
Lines 6-9: We use the
add()method to add four new elements (i.e.,1,2,3, and4) to thedeque. -
Line 13: We create a new
Listobject namedlist1with two elements,[1,4], using thelistOfmethod. -
Line 15: We use the
removeAllmethod to remove all elements of thelist1present in thedeque. In our case, thedequehas some elements which will match the elements oflist1. Those matched elements will be removed andtrueis returned.
* elements of deque is - [1,2,3,4]
* elements of list1 is - [1,4]
deque.removeAll(list1) - [2,3]
-
Line 17: We create a new
Listobject namedlist2with two elements,[5, 10], using thelistOfmethod. -
Line 19: We use the
removeAllmethod to remove all elements of thelist2from thedeque. In our case, no elements oflist2are present in thedeque, so thedequeremains unchanged, andfalseis returned.
* elements of deque - 2,3
* elements of list2 - 5,10
Elements of list2 are not present in the deque.
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