Janet, like some other lisps, has the arrow macro, which allows you to write in the “OO” style.
(-> a (fun b c)) (-> a (fun b c)) (define-syntax ->
(syntax-rules ()
;; first expression is left unchanged
[(-> expr) expr]
;; take from the back, wrap other calls
[(-> expr* ... (op args* ...))
(op args* ... (-> expr* ...))]
;; make parens unnecessary in trivial case of no further arguments
[(-> expr* ... op)
(op (-> expr* ...))]))