Variables & Scalars
25 published questions
What you’ll find here
- Short, practical answers with runnable Perl code blocks.
- Sandbox-verified output (proof that the example actually runs).
- Notes on common pitfalls and version differences.
- advanced • 2025-12-30How to use autovivification with hash references in Perl?
- advanced • 2025-12-30How to create a nested hash structure in Perl?
- intermediate • 2025-12-30How to use the each() function to iterate over a hash in Perl?
- beginner • 2025-12-30How to get all values from a hash in Perl?
- beginner • 2025-12-30How to get all keys from a hash in Perl?
- beginner • 2025-12-30How to delete a hash key in Perl?
- beginner • 2025-12-30How to check if a hash key exists in Perl?
- advanced • 2025-12-30How to create a reference to a subroutine in Perl?
- beginner • 2025-12-30How to swap two scalar variables in Perl?
- intermediate • 2025-12-30How to use the $# array index variable in Perl?
- advanced • 2025-12-30How to create a multidimensional array using references in Perl?
- intermediate • 2025-12-30How to iterate over hash keys using a reference in Perl?
- intermediate • 2025-12-30How to access array elements through a reference in Perl?
- intermediate • 2025-12-30How to create a reference to a scalar in Perl?
- intermediate • 2025-12-30How to get the type of a reference in Perl using ref()?
- intermediate • 2025-12-30How to check if a variable is a reference in Perl?
- beginner • 2025-12-30How to check if a scalar variable is defined in Perl?
- intermediate • 2025-12-30How to create an anonymous hash in Perl?
- intermediate • 2025-12-30How to create an anonymous array in Perl?
- intermediate • 2025-12-30How to dereference a hash reference in Perl?
- intermediate • 2025-12-30How to create a reference to an array in Perl?
- beginner • 2025-12-30How to initialize a hash in Perl with key-value pairs?
- beginner • 2025-12-30How to create an array in Perl and access its elements?
- beginner • 2025-12-30How to declare and assign a scalar variable in Perl?
- intermediate • 2025-12-29What does $_ mean in Perl?