Why Dictionary Lookups Are Instant #coding #programming #datastructures #algorithms
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YouTubeThe Debug Zone
Why Dictionary Lookups Are Instant #coding #programming #datastructures #algorithms
You look up a key in a Python dictionary or JavaScript object. It returns instantly. How? It doesn't search. It calculates exactly where to look. A hash function takes the key, runs some math on the characters, and produces a number, the bucket index. Every lookup goes directly to that bucket. O(1). Constant time. Doesn't matter if there are 10 ...
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