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git diff shows how text differs between two versions of a file. Its default output uses a format called unified diff: a little context around each change, with prefixes that distinguish added, removed, and unchanged lines. [Read More]

Rails is productive for JSON APIs as well as server-rendered applications. This walkthrough sketches a small storefront API with a product catalog, a customer’s cart, and a checkout that snapshots prices and reserves inventory safely. [Read More]

C++ has gained a steady stream of features since C++14 that make common code shorter and more expressive. The important change is not simply fewer characters: type deduction, standard vocabulary types, ranges, and compile-time constraints can make intent clearer while preserving control over performance and resources. [Read More]

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Linear algebra studies vectors, the spaces they inhabit, and the transformations that act on them. It is useful in fields ranging from computer graphics and data science to physics and differential equations. [Read More]