How to remove an element from the SplayTreeSet in Dart
Overview
We can use the remove() method to remove an element from the SplayTreeSet.
Syntax
bool remove(Object value);
Parameters
The element to be removed from the SplayTreeSet is passed as an argument.
Return value
This method returns true if the element is present and removed from the SplayTreeSet. Otherwise, false will be returned.
Examples
The code below demonstrates how to use the remove() method to remove an element from the SplayTreeSet:
import 'dart:collection';
void main() {
//create a new SplayTreeSet which can have int type elements
SplayTreeSet set = new SplayTreeSet<int>((a,b) => b.compareTo(a));
// add five elements to the set
set.add(5);
set.add(4);
set.add(3);
set.add(2);
set.add(1);
print('The set is $set');
// Remove element 5
bool isRemoved = set.remove(5);
print('\nIs element 5 removed from set : $isRemoved');
print('The set is $set');
// Remove element 10
isRemoved = set.remove(10);
print('\nIs element 10 removed from set : $isRemoved');
print('The set is $set');
}Explanation
-
Line 1: We import the
collectionlibrary. -
Line 4: We create a new
SplayTreeSetobject with the nameset. We pass acomparefunction as an argument. This function is used for maintaining the order of thesetelements. In our case, thecomparefunction orders the elements in descending order. -
Lines 7–11: We add five new elements to the
set. Now, the set is{5,4,3,2,1}. -
Line 16: We use the
remove()method to remove the element5. The element5is present in thesetso it is removed andtrueis returned. -
Line 21: We use the
remove()method to remove the element10. The element10is not present in thesetsofalseis returned and thesetremains unchanged.
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