Thanks for your advice, Alex. I'll be used to require point-free package.
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I want to be close this issue but I cannot close by my response. Please
post any message.
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I see. I understand that racket's threading macros are NOT SIMPLE
IMPLEMENTATIONS.
Racket's threading macros can reduce lambda object creations.
#lang racket
(require threading)
(define (add2 x) (+ x 2))
(~> 1 add2) ; ok
(~> 1 ((lambda (x) (+ x 2)) _)) ; ng -> ok
(~> 1 ((curry + 2) _)) ; ng -> o
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