How to Filter Elements of an Array based on a Condition in Perl - Step by Step Examples

How to Filter Elements of an Array based on a Condition in Perl ?

Answer

To filter elements of an array based on a condition in Perl, you can use built-in functions like grep or map along with subroutines or anonymous functions.

✐ Examples

1 Filter Even Numbers

In this example,

We have an array named @numbers containing integers.
We use the grep function with an anonymous subroutine to filter out even numbers into a new array named @even_numbers.
We print the filtered array to demonstrate the filtering.

Perl Program

@numbers = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
@even_numbers = grep { $_ % 2 == 0 } @numbers;
print "Even Numbers: @even_numbers\n";

Output

Even Numbers: 2 4 6 8 10

2 Filter Strings by Length

In this example,

We have an array named @words containing strings.
We use the grep function with an anonymous subroutine to filter strings by their length into a new array named @filtered_words.
We print the filtered array to demonstrate the filtering.

Perl Program

@words = ("apple", "banana", "cherry", "date", "fig");
@filtered_words = grep { length($_) > 5 } @words;
print "Filtered Words: @filtered_words\n";

Output

Filtered Words: banana cherry

Summary

In this tutorial, we learned How to Filter Elements of an Array based on a Condition in Perl language with well detailed examples.

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