The reason I started this meetup was because so many people feel like this :) The funny thing is, 'lists, sets and maps' aren't actually specific data structur

The reason I started this meetup was because so many people feel like this :) The funny thing is, 'lists, sets and maps' aren't actually specific data structures—they're actually collections of operations with certain expectations (a.k.a an 'interface'). How is an associative array implemented, for example? The language you use, which provides you with a standard implementation, has made that decision for you. But there are so many more, and they all have trade-offs.