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Series · 1 part · ~9 min read

Performance foundations: Big-O and data structures through frontend code

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Big-O and the data structures behind it explained through real frontend code — React re-renders, DOM queries, Map lookups. No textbook examples.

  1. 01

    Big-O without the math: what your code really costs

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    Your code runs perfectly on ten items and stutters on ten thousand - even though not a single line changed. Big-O doesn't tell you "how fast," only "how the cost grows as the amount of data grows." How to spot the shape of that growth in everyday frontend code - and how to turn a loop inside a loop into something that doesn't slow down on large data.

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