Perl Tutorial 17 – Hashes: reverse, sort, merge

https://www.SouthAmericanPostcard.com/
Part 17 of the Perl Tutorial shows how to reverse the key/value pairs of a hash, sort hashes and merge hashes. South America Photo Map (Free Android App)
https://play.google.com/store/apps/details?id=com.saj.pinmap
In English, Spanish & Portuguese!

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Android: https://play.google.com/store/apps/details?id=com.southamericajourney&hl=en
IOS: https://apps.apple.com/us/app/south-america-journey/id1075921447