If we're counting only programming languages (and not fill-out forms), Prolog ha... | Hacker News

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		lieks on Jan 11, 2025 \| parent \| context \| favorite \| on: C++26: A Placeholder with No Name If we're counting only programming languages (and not fill-out forms), Prolog had it in 1971, before ML. ASCII didn't include _ until its 1963 draft, so it's probably somewhere in that time. I'll guess it's probably Prolog, but maybe Planner (Prolog's predecessor) had it too.

fanf2 on Jan 11, 2025 [–]

ASCII 1963 was the first version of the standard and it lacked _ https://dl.acm.org/doi/10.1145/366707.367524

The 1965 draft had _ https://dl.acm.org/doi/10.1145/363831.363839

The first standard edition with _ was 1968 https://www.rfc-editor.org/info/rfc20

The 1977 version is also available https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub1-2-197...

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