We can use the any()
method to check if any element of the SplayTreeSet
satisfies the provided test condition.
This method loops through all the elements of the SplayTreeSet
in the iteration order. It checks each element against the test condition.
bool any(bool test(E element));
A
This method returns true if any of the SplayTreeSet
elements satisfies the provided test condition. Otherwise, false
will be returned.
The code below demonstrates how to use the any()
method to check if any item of SplayTreeSet
matches a provided test condition:
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'); // check if set contains any element greater than 4 bool result = set.any( (e)=> e > 4 ); print('If the set contains any element greater than 4 : $result'); // check if set contains any negative element result = set.any( (e)=> e < 0 ); print('If the set contains any negativee element : $result'); }
Line 1: We import the collection
library.
Line 4: We create a new SplayTreeSet
object with the name set
. We pass a compare
function as an argument. This function is used for maintaining the order of the set
elements. In our case, the compare
function 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 any()
method with a predicate function. The predicate function checks if the element is greater than 4. In our case, the set contains element 5, which is greater than 4. Hence, we will get true
.
Line 20: We use the any()
method with a predicate function. The predicate function checks if the element is negative. In our case, the set
doesn’t contain any negative elements. Hence, we’ll get false
.
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