Null was a billion-dollar mistake. Falsy was the second.
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Null was a billion-dollar mistake. Falsy was the second. "I call it my billion-dollar mistake. It was the invention of the null reference in 1965." — Tony Hoare, 2009 Tony Hoare gets to call it a billion-dollar mistake because he invented null and watched the industry pay for it for forty years. Most of us inherited that mistake and added our own contributions on top. JavaScript, in particular, made two design choices in the 1990s that we are still paying for in 2026 and will keep