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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.lisp
Subject: Re: Lisp history: IF, etc.
Date: Wed, 03 Apr 2024 13:56:46 -0700
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Alan Bawden <alan@csail.mit.edu> writes:
> McCarthy invented the conditional expression and thus created the
> first expression-only programming language.

I think Church's lambda calculus also had this.

https://en.wikipedia.org/wiki/Church_encoding#Church_Booleans