Maps in C++ (std::map and std::unordered_map) - YouTube

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Chapters:
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0:00 - What are maps?
3:40 - Why use maps + example usage
9:30 - Writing a hash function to use a custom type
16:50 - The [] operator
19:00 - The .at() function
20:40 - How to check if key exists in map
21:11 - How to iterate through maps
24:47 - How to remove entries from maps
25:03 - Writing a less-than operator for custom types
28:05 - Performance and which map to use

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