diff options
Diffstat (limited to 'racket.html.markdown')
| -rw-r--r-- | racket.html.markdown | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/racket.html.markdown b/racket.html.markdown index d69e7c0d..1a02f988 100644 --- a/racket.html.markdown +++ b/racket.html.markdown @@ -205,15 +205,6 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) <-- no `d' ;; Use `hash-remove' to remove keys (functional too) (hash-remove m 'a) ; => '#hash((b . 2) (c . 3)) -;; Create an empty mutable hash table and manipulate it -(define m3 (make-hash)) -(hash-set! m3 'a 1) -(hash-set! m3 'b 2) -(hash-set! m3 'c 3) -(hash-ref m3 'a) ; => 1 -(hash-ref m3 'd 0) ; => 0 -(hash-remove! m3 'a) - ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; 3. Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; @@ -222,7 +213,7 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) <-- no `d' ;; A function always returns the value of its last expression (lambda () "Hello World") ; => #<procedure> ;; Can also use a unicode `λ' -(λ () "Hellow World") ; => same function +(λ () "Hello World") ; => same function ;; Use parens to call all functions, including a lambda expression ((lambda () "Hello World")) ; => "Hello World" @@ -464,6 +455,15 @@ n ; => 6 (vector-set! wall 99 'down) vec ; => #(1 2 3 4) +;; Create an empty mutable hash table and manipulate it +(define m3 (make-hash)) +(hash-set! m3 'a 1) +(hash-set! m3 'b 2) +(hash-set! m3 'c 3) +(hash-ref m3 'a) ; => 1 +(hash-ref m3 'd 0) ; => 0 +(hash-remove! m3 'a) + ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; 7. Modules ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; @@ -562,7 +562,7 @@ vec ; => #(1 2 3 4) (swap! a b) (printf "tmp = ~a; a = ~a; b = ~a\n" tmp a b) ; tmp is unaffected -;; But the are still code transformations, for example: +;; But they are still code transformations, for example: (define-syntax-rule (bad-while condition body ...) (when condition body ... |