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1. Reduce Reduce

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   # Reduce

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   This is a quest for a deeper understanding of reduce, exploring transducers. The language of choice here is JavaScript for purely arbitrary reasons. This discussion is not JavaScript-specific.

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2. null null

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   # null

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   > I call it my billion-dollar mistake. It was the invention of the null reference in 1965. At that time, I was designing the first comprehensive type system for references in an object oriented language (ALGOL W). My goal was to ensure that all use of references should be absolutely safe, with checking performed automatically by the compiler. But I couldn't resist the temptation to put in a null reference, simply because it was so easy to implement. This has led to innumerable errors, vulnerabilities, and system crashes, which have probably caused a billion dollars of pain and damage in the last forty years.

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   \- Tony Hoare

3. Rule of Three Rule of Three

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   ### Rule of Three — a short story about money, debt, and banks

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   Alice is broke and in need of $100 to buy food. She goes to Bob and tells him about her problem.

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   Bob is actually broke as well, but he keeps quiet about that and presents his idea: