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Other data structures exists?
(sh.itjust.works)
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I'm just poking fun that the fundamental type in JS (Object) is an associative-array/hashmap. Technically it has some fancy under-the-hood handling for pure arrays and primitive types. This is also exactly true of Lua, and a little true of Ruby and Python.
Really, most programmers would do great to start with a hash map or array list and only specialize out further when the problem calls for it.