Please check this : https://www.mql5.com/en/docs/standardlibrary/datastructures
You can also check the Codebase.

Documentation on MQL5: Standard Library / Classes of data
- www.mql5.com
Standard Library / Classes of data - Reference on algorithmic/automated trading language for MetaTrader 5
Thanks a lot!

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Hello MQL4/5 Community,
I have a C++ Python backround and I am working recently on an MQL4 EA. First thing I realised that there are basicly no containers. No Maps/Vector/Lists... (if I am wrong please correct me)
So I was wondering since everybody will already have created custom containers: Why dont we share our containers, so nobody needs to do those trivial jobs in the future.
I uploaded a vector-like container.
Again: I am not really an MQL experienced developer, so if someone can do it better, please correct me.
Would be good if others also share their containers.
For example a linked list.
https://github.com/ConKreter/MQL-Container/blob/master/Vector.mqh
Kind Regards
Adrian Kreter