How to use the union() method of LinkedHashSet in Dart
Overview
The union() method returns a new set by combining all the elements of the current set with the Set passed as an argument.
Syntax
Set<E> union(Set<E> other)
Parameter
This method takes a Set to be combined with the current Set as an argument.
Return value
This method returns a new set with all the elements of the current Set and the Set that is passed as an argument.
Code
The code below demonstrates the use of the union() method :
import 'dart:collection';
void main() {
//create a new LinkedHashSet which can have int type elements
LinkedHashSet set1 = new LinkedHashSet<int>();
// add three elements to the set
set1.add(1);
set1.add(2);
set1.add(3);
print('The set1 is $set1');
//create another LinkedHashSet
LinkedHashSet set2 = new LinkedHashSet<int>();
// add three elements to the set
set2.add(3);
set2.add(4);
set2.add(5);
print('The set2 is $set2');
var unionResult = set1.union(set2); // combine set1 and set2
print('\nset1.union(set2) : $unionResult');
}Explanation
-
Line 1: We import the
collectionlibrary. -
Lines 4 to 9: We create a new
LinkedHashSetobject namedset1. We then use theadd()method to add three elements (1,2,3) to theset1object. -
Lines 13 to 17: We create another
LinkedHashSetobject namedset2. We then use theadd()method to add three elements (3,4,5) to theset2object. -
Line 20: We use the
union()method onset1withset2as an argument. This method returns a newSetcontaining all theset1andset2elements. The elements of the returned set are[1,2,3,4,5].
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