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Why building for imagined future needs backfires: the YAGNI principle explained

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A freelance developer in Paris spent a weekend adding multi-currency support with live exchange rates, four languages, and exports to three accounting tools. None of these features was ever used, while the exchange-rate API's changed terms eventually broke the invoices page. The author compares this to packing three suitcases for a beach weekend, only to spend it in a swimsuit. The YAGNI principle from Extreme Programming advises building only what is needed now, since future needs rarely match what was predicted. The article illustrates the approach with code examples, including an unused currencies table and a rate-conversion service.

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