How to check if a Set is Empty in Perl - Step by Step Examples

◀ Previous Next ▶

How to check if a Set is Empty in Perl ?

Answer

To check if a Set is empty in Perl, you can check if the Set has any elements using the scalar function.

✐ Examples

1 Check if Set is Empty

In this example,

We declare a Set named %set and initialize it with some elements, or an empty Set if there are no elements.
We use the scalar function to get the number of elements in the Set %set.
If the count is 0, it means the Set is empty; otherwise, it has elements.
We print the result to the standard output to indicate whether the Set is empty or not.

Perl Program

my %set = (); # Or initialize with elements for a non-empty Set
my $isEmpty = scalar(keys %set) == 0;
if ($isEmpty) {
    print "The Set is empty\n";
} else {
    print "The Set is not empty\n";
}

Output

The Set is empty

2 Check if Empty Set is Empty

In this example,

We declare an empty Set named %emptySet.
We use the scalar function to get the number of elements in the Set %emptySet.
Since the count is 0, it means the Set is empty.
We print the result to the standard output to indicate that the Set is indeed empty.

Perl Program

my %emptySet = ();
my $isEmpty = scalar(keys %emptySet) == 0;
if ($isEmpty) {
    print "The Set is empty\n";
} else {
    print "The Set is not empty\n";
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Empty in Perl language with well detailed examples.

◀ Previous Next ▶