How to check if a Set is Not Empty in Perl

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How to check if a Set is Not Empty in Perl ?

Answer

In Perl, you can use the scalar context to check if a Set is not empty.

✐ Examples

1 Check if Set is Not Empty

In this example,

We declare a Set using a Perl array and initialize it with some elements.
We use the scalar operator in scalar context on the Set to determine its size.
If the size of the Set is greater than 0, it means the Set is not empty; otherwise, it is empty.
We print the result to the standard output to indicate whether the Set is not empty or not.

Perl Program

# Initialize a Set
my @set = (1, 2, 3); # Or my @set;

# Check if Set is not empty
if (scalar @set) {
    print 'The Set is not empty\n';
} else {
    print 'The Set is empty\n';
}

Output

The Set is not empty

2 Check if Empty Set is Not Empty

In this example,

We declare an empty Set using a Perl array.
We use the scalar operator in scalar context on the Set to determine its size.
Since the size of the Set 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

# Initialize an empty Set
my @empty_set;

# Check if Empty Set is not empty
if (scalar @empty_set) {
    print 'The Set is not empty\n';
} else {
    print 'The Set is empty\n';
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Not Empty in Perl language with well detailed examples.

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How to check if a Set is Not Empty in Perl

How to check if a Set is Not Empty in Perl ?

Answer

✐ Examples

1 Check if Set is Not Empty

Perl Program

Output

2 Check if Empty Set is Not Empty

Perl Program

Output

Summary

More Perl Sets Tutorials