Anders Hejlsberg, creator of C# and TypeScript, shares his philosophy on programming language design and evolution. He outlines three phases: the foundational v1.0 where core decisions are irreversible, the follow-up releases filling in the original vision, and the long-term maturity phase where restraint becomes critical. He argues that features can be added but never removed without breaking user code, so mature language design is about ruthlessly filtering proposals — he jokes every new feature starts at -500 points and must earn its way back. He also reflects on his personal experience designing Turbo Pascal, C#, and TypeScript, noting each presented unique challenges.
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