N Best Programming Techniques
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fact n = case n of | fact n = case n of | ||
| - | + | 0 -> 1 | |
| - | + | _ -> n * (fact $ n - 1) | |
</pre> | </pre> | ||
Revision as of 03:42, 11 February 2007
Ten best programming techniques you're (probably) not using.
Contents |
Pattern matching
Common Lisp (destructuring-bind)
[1]> (defun foo (a-list)
(destructuring-bind (a &rest b) a-list
(list a b)))
FOO
[2]> (foo '(1 2 3 4))
(1 (2 3 4))
[3]>
Erlang
-module(example).
-export(hello/1]).
hello("wtd") ->
io:format("Hello, ~s!~n", [Name]);
hello(Name) ->
io:format("Get out!!~n", []).
Scala
def fact(n : int) : int = n match {
case 0 => 1
case _ => n * fact(n - 1)
}
Haskell
fact 0 = 1 fact n = n * (fact $ n - 1)
fact n = case n of
0 -> 1
_ -> n * (fact $ n - 1)
fact n | n == 0 = 1 | otherwise = n * (fact $ n - 1)
O'Caml
# let rec fact n =
match n with
1 -> 1
| o -> o * fact (o - 1);;
# let rec fact =
function
1 -> 1
| o -> o * fact (o - 1);;
# let fact n =
let rec fact' n acc =
match n with
1 -> acc
| o -> fact (o - 1) (n * acc)
in
fact' n 1;;
