Thursday, February 8, 2024

null: the billion dollar mistake

 I tried to look smart today when one of my teammates mentioned realizing he was finding new problems with a data stream because previously some other process was treating null as zero...

It had me hunt down this quote from Tony Hoare on the invention of null:

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.

Heh.

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