#lang racket
(require racket/format)
(define pp_number
(lambda (n)
(~a n #:width 6 #:align 'right #:left-pad-string "0")))
(define fp
(lambda (s n)
(string-append (pp_number n) " + " s)))
(define f
(lambda (s n)
(format "~a + ~a" n s)))
(foldl f "" '(1 2 3))
; works great !
(foldl fp "" '(1 2 3))
; and why not this one ?
Thanks in advance.
Cyrille
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