Developer builds free algorithm playground to fix how programmers learn sorting

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A developer on DEV Community has launched a free, no-signup interactive playground featuring 15 algorithms, designed to address what they see as a fundamental flaw in how algorithms are typically taught. The author argues that most learners encounter complexity notations like O(n²) before understanding the underlying mechanics, which leaves them unable to reason through interview questions under pressure. The post outlines a structured learning sequence: first watch an algorithm run on a small dataset, then identify its loop invariant, and only then derive its complexity cost. Using examples like quicksort and insertion sort, the author demonstrates how understanding invariants reveals distinctions that Big-O tables deliberately obscure. The playground is positioned as a companion tool to this method, intended to make the step-by-step observation phase concrete and accessible.

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