Why Trie Beats HashMap for Prefix Matching in Search and Autocomplete Systems

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A Trie is a data structure designed to handle prefix-based searches, where users type partial input and expect instant suggestions. Unlike a HashMap, which efficiently retrieves exact values, a Trie organizes data so that all words sharing a common prefix follow the same path through the structure. This makes it well-suited for features like search autocomplete, contact lookup, product search, and code completion. Using a HashMap for prefix matching requires scanning large portions of the dataset, which becomes inefficient as data grows. Developers are advised to ask not where to store strings, but how users will search for them, before choosing a data structure.

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