Personally I love hashmaps, they are an elegant way to quickly and efficiently store unsorted data in an organized fashion. I typically use them in situations such as spatial hashing, which makes many of my collision based algorithms so much more efficient. I also use them for situations where I need only one of each type, as hashmaps can only have a single key to value relationship. Overall their O(1) nature and their intrinsic properties make them a favorite for me!
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Personally I love hashmaps, they are an elegant way to quickly and efficiently store unsorted data in an organized fashion. I typically use them in situations such as spatial hashing, which makes many of my collision based algorithms so much more efficient. I also use them for situations where I need only one of each type, as hashmaps can only have a single key to value relationship. Overall their O(1) nature and their intrinsic properties make them a favorite for me!