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#Algorithms
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April 21, 2026
15 Data Structures Every Developer Should Actually Understand
From arrays to LRU caches, these 15 data structures sit underneath your database, your browser, your OS scheduler, and your favorite frameworks. This post walks each one — how it works, what it costs, where it shows up in production — with Mermaid diagrams, code, and a big-O cheat sheet at the end.