Data Structures
30 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 the reduce function from List::Util in Perl?
- advanced • 2025-12-30How to create a hash of arrays in Perl?
- advanced • 2025-12-30How to create an array of hashes in Perl?
- advanced • 2025-12-30How to sort hash by values in Perl?
- intermediate • 2025-12-30How to sort hash keys in Perl?
- intermediate • 2025-12-30How to merge two hashes in Perl?
- intermediate • 2025-12-30How to invert a hash (swap keys and values) in Perl?
- intermediate • 2025-12-30How to create a hash from two arrays in Perl?
- beginner • 2025-12-30How to iterate over an array with index using for in Perl?
- beginner • 2025-12-30How to iterate over an array with foreach in Perl?
- advanced • 2025-12-30How to use splice to modify an array in Perl?
- beginner • 2025-12-30How to copy an array in Perl?
- beginner • 2025-12-30How to merge two arrays in Perl?
- intermediate • 2025-12-30How to check if an element exists in an array in Perl?
- intermediate • 2025-12-30How to find the index of an element in an array in Perl?
- intermediate • 2025-12-30How to remove duplicates from an array in Perl?
- intermediate • 2025-12-30How to slice an array in Perl?
- beginner • 2025-12-30How to get the length of an array in Perl?
- beginner • 2025-12-30How to split a string into an array in Perl?
- beginner • 2025-12-30How to join array elements into a string in Perl?
- intermediate • 2025-12-30How to use grep to filter array elements in Perl?
- intermediate • 2025-12-30How to use the map function to transform array elements in Perl?
- intermediate • 2025-12-30How to use a custom comparison function with sort in Perl?
- intermediate • 2025-12-30How to sort an array numerically in Perl?
- beginner • 2025-12-30How to sort an array alphabetically in Perl?
- beginner • 2025-12-30How to reverse an array in Perl?
- beginner • 2025-12-30How to unshift elements to the beginning of an array in Perl?
- beginner • 2025-12-30How to shift elements from the beginning of an array in Perl?
- beginner • 2025-12-30How to pop elements from an array in Perl?
- beginner • 2025-12-30How to push elements onto an array in Perl?