Click the green flag and watch my magical implementation of new first-class data structures in Scratch be cool and stuff. Then look inside and learn about how to use the custom blocks, and use them in your own projects (please do give credit though)! !!! IMPORTANT !!! new empty list doesn't currently work properly in all cases. I might fix this at one point. :P also this is really broken right now. sorry.
Credit to @Jonathan50 for basically introducing me to the concept of linked lists through pairs and the return implementation used here in his own linked lists project. All else is completely made by me! Update: Added hashtables and modified parts of the linked lists! No new documentation for now though.