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bug#4136: 23.1; delete-pair

From: Drew Adams
Subject: bug#4136: 23.1; delete-pair
Date: Mon, 16 Nov 2020 13:37:09 -0800 (PST)

> The closest function that I found is:
>   (cl-plusp NUMBER)
>   Return t if NUMBER is positive.
> but I'm not sure why it would be better than using just (> number 0).

It's there to emulate a Common Lisp predicate, `plusp'.

Why does Common Lisp have `plusp'?  Presumably for
use with higher-order functions, to not have to use
a lambda form etc.

(mapcar #'plusp '(4 -3.1 0 42))
(mapcar (lambda (x) (> x 0)) '(4 -3.1 0 42))

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