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Manu 2013-07-16 21:42:38 +12:00
parent 11add1c50d
commit 752a6a9893
1 changed files with 11 additions and 11 deletions
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racket.html.markdown
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@ -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 ...