(sigil fp chain)

(sigil fp chain) - Threading Macros

Thread values through sequences of expressions, similar to Clojure's threading macros and SRFI-197.

Basic Threading

(import (sigil fp chain))

;; Thread-first (no placeholder needed)
(chain 5 (+ 3) (* 2))
; => 16 (same as (* (+ 5 3) 2))

;; Explicit placeholder with _
(chain '(1 2 3)
       (map (lambda (x) (* x 2)) _)
       (apply + _))
; => 12

Short-Circuit Threading

;; Returns #f if any step produces #f
(some-> user
        (dict-ref _ name:)
        (string-split " " _)
        car)