What are some common use cases of HashMap in programming?
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What are some common use cases of HashMap in programming?
HashMap is often used for implementing associative arrays, caching data, and counting occurrences of items.
Can you give me an example of how it's used in caching?
Sure! In caching, HashMap can store key-value pairs where the key is a unique identifier and the value is the cached data.
What about counting occurrences? How does that work?
You can use HashMap to count occurrences by using the item as the key and incrementing its value each time it appears.
Are there any performance considerations I should be aware of?
Yes, while HashMap offers average O(1) time complexity for insertions and lookups, poor hash functions can lead to collisions and degrade performance.
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