diff options
Diffstat (limited to 'racket.html.markdown')
| -rw-r--r-- | racket.html.markdown | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/racket.html.markdown b/racket.html.markdown index 015467d9..02c3e228 100644 --- a/racket.html.markdown +++ b/racket.html.markdown @@ -101,7 +101,7 @@ some-var ; => 5 ;; Accessing a previously unassigned variable is an exception ; x ; => x: undefined ... -;; Local binding: me is bound to "Bob" only within (let ...) +;; Local binding: `me' is bound to "Bob" only within the (let ...) (let ([me "Bob"]) "Alice" me) ; => "Bob" @@ -119,7 +119,7 @@ my-pet ; => #<dog> (dog-name my-pet) ; => "lassie" ;;; Pairs (immutable) -;; "cons" constructs pairs, "car" and "cdr" extract the first +;; `cons' constructs pairs, `car' and `cdr' extract the first ;; and second elements (cons 1 2) ; => '(1 . 2) (car (cons 1 2)) ; => 1 @@ -130,10 +130,10 @@ my-pet ; => #<dog> ;; Lists are linked-list data structures (list 1 2 3) ; => '(1 2 3) -;; Use "cons" to add an item to the beginning of a list +;; Use `cons' to add an item to the beginning of a list (cons 4 '(1 2 3)) ; => (4 1 2 3) -;; Use "append" to add lists together +;; Use `append' to add lists together (append '(1 2) '(3 4)) ; => (1 2 3 4) ;;; Vectors @@ -141,7 +141,7 @@ my-pet ; => #<dog> ;; Vectors are fixed-length arrays #(1 2 3) ; => '#(1 2 3) -;; Use "vector-append" to add vectors together +;; Use `vector-append' to add vectors together (vector-append #(1 2 3) #(4 5 6)) ; => #(1 2 3 4 5 6) ;;; Sets @@ -149,13 +149,13 @@ my-pet ; => #<dog> ;; create a set from a list (list->set '(1 2 3 1 2 3 3 2 1 3 2 1)) ; => (set 1 2 3) -;; Add a member with "set-add" +;; Add a member with `set-add' (set-add (set 1 2 3) 4); => (set 1 2 3 4) -;; Remove one with "set-remove" +;; Remove one with `set-remove' (set-remove (set 1 2 3) 1) ; => (set 2 3) -;; Test for existence with "set-member?" +;; Test for existence with `set-member?' (set-member? (set 1 2 3) 1) ; => #t (set-member? (set 1 2 3) 4) ; => #f @@ -173,14 +173,14 @@ my-pet ; => #<dog> ;; You can provide a default value for missing keys (hash-ref m 'd 0) ; => 0 -;; Use "hash-set" to extend a hash table +;; Use `hash-set' to extend a hash table (define m2 (hash-set m 'd 4)) m2 ; => '#hash((b . 2) (a . 1) (d . 4) (c . 3)) ;; Remember, these hashes are immutable! m ; => '#hash((b . 2) (a . 1) (c . 3)) -;; Use "hash-remove" to remove keys +;; Use `hash-remove' to remove keys (hash-remove m 'a) ; => '#hash((b . 2) (c . 3)) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; @@ -230,16 +230,16 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) ;; 4. Equality ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -;; for numbers use "=" +;; for numbers use `=' (= 3 3.0) ; => #t (= 2 1) ; => #f -;; for object identity use "eq?" +;; for object identity use `eq?' (eq? 3 3) ; => #t (eq? 3 3.0) ; => #f (eq? (list 3) (list 3)) ; => #f -;; for collections use "equal?" +;; for collections use `equal?' (equal? (list 'a 'b) (list 'a 'b)) ; => #t (equal? (list 'a 'b) (list 'b 'a)) ; => #f @@ -261,7 +261,7 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) 'nope) ; => 'yep -;; "cond" chains a series of tests to select a result +;; `cond' chains a series of tests to select a result (cond [(> 2 2) (error "wrong!")] [(< 2 2) (error "wrong again!")] [else 'ok]) ; => 'ok @@ -305,13 +305,13 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) (for/hash ([i '(1 2 3)]) (values i (number->string i))) ; => '#hash((1 . "1") (2 . "2") (3 . "3")) -;; To combine iteration results, use "for/fold" +;; To combine iteration results, use `for/fold' (for/fold ([sum 0]) ([i '(1 2 3 4)]) (+ sum i)) ; => 10 ;;; Sequences -;; "for" allows iteration over sequences: +;; `for' allows iteration over sequences: ;; lists, vectors, strings, sets, hash tables, etc... (for ([i (in-list '(l i s t))]) (displayln i)) @@ -330,8 +330,8 @@ m ; => '#hash((b . 2) (a . 1) (c . 3)) ;;; Exceptions -;; To catch an exception, use the "with-handlers" form -;; To throw an exception use "raise" +;; To catch an exception, use the `with-handlers' form +;; To throw an exception use `raise' (with-handlers ([(lambda (v) (equal? v "infinity")) (lambda (exn) +inf.0)]) @@ -349,7 +349,7 @@ n ; => 6 ;; Many Racket datatypes can be immutable or mutable ;; (Pairs, Lists, Strings, Vectors, Hash Tables, etc...) -;; Use "vector" to create a mutable vector +;; Use `vector' to create a mutable vector (define vec (vector 2 2 3 4)) ;; Use vector-set! to update a slot (vector-set! vec 0 1) @@ -375,10 +375,10 @@ vec ; => #(1 2 3 4) (printf fmt (make-string n ch)) (newline))) -;; Use "require" to import all functions from the module +;; Use `require' to import all functions from the module (require 'cake) (print-cake 3) -; (show "~a" 1 #\A) ; => error, "show" was not exported +; (show "~a" 1 #\A) ; => error, `show' was not exported ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; 8. Classes and Objects @@ -400,7 +400,7 @@ vec ; => #(1 2 3 4) (define charlie (new fish% [size 10])) -;; Use "send" to call an object's methods +;; Use `send' to call an object's methods (send charlie grow 6) (send charlie get-size) ; => 16 |