Answer
Dictionary uses a hash table. The key's hash determines its bucket for near O(1) lookups.
Good hashing minimizes collisions, improving performance.
Quick Answer
Dictionary uses a hash table — it computes a hash of the key, finds the right bucket, and stores the value there. This gives near O(1) lookups on average. When many keys hash to the same bucket (collisions), performance degrades. A good GetHashCode() implementation keeps collisions minimal.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ