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 -> ok
(define adder%
(class object%
(super-new)
(init-field x)
(define/public (incr) (lambda (y) (+ x y)))))
(define adder (new adder% [x 2]))
(send adder incr) ; ok
(~> 1 ((send adder incr) _)) ; ng -> ok
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