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When is memoization automatic in GHC Haskell?
...situations. For example, consider the function
f = \x -> let y = [1..30000000] in foldl' (+) 0 (y ++ [x])
GHC might notice that y does not depend on x and rewrite the function to
f = let y = [1..30000000] in \x -> foldl' (+) 0 (y ++ [x])
In this case, the new version is much less effici...
Getting the docstring from a function
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answered Apr 3 '09 at 9:05
unwindunwind
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Capturing Ctrl-c in ruby
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answered Jan 18 '10 at 21:46
Wayne ConradWayne Conrad
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LINQ Ring: Any() vs Contains() for Huge Collections
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CarenRose
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answered Dec 14 '10 at 23:14
Etienne de MartelEtienne de Martel
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How can I find all matches to a regular expression in Python?
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Mike Fogel
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answered Jan 15 '11 at 3:54
AmberAmber
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PHP code to convert a MySQL query to CSV [closed]
...;
(the documentation for this is here: http://dev.mysql.com/doc/refman/5.0/en/select.html)
or:
$select = "SELECT * FROM table_name";
$export = mysql_query ( $select ) or die ( "Sql error : " . mysql_error( ) );
$fields = mysql_num_fields ( $export );
for ( $i = 0; $i < $fields; $i++ )
{
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Any way to declare a size/partial border to a box?
...o declare a size/partial border to a box in CSS? For example a box with 350px that only shows a border-bottom in its firsts 60px . I think that might be very useful.
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Format LocalDateTime with Timezone in Java8
...yyMMdd HH:mm:ss.SSSSSS Z");
ZonedDateTime.now().format(FORMATTER);
=> "20140829 14:12:22.122000 +09"
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Python Flask Intentional Empty Response
... HTTP server must return something. The HTTP 'empty response' response is 204 No Content:
return ('', 204)
Note that returning a file to the browser is not an empty response, just different from a HTML response.
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Left-pad printf with spaces
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If you want the word "Hello" to print in a column that's 40 characters wide, with spaces padding the left, use the following.
char *ptr = "Hello";
printf("%40s\n", ptr);
That will give you 35 spaces, then the word "Hello". This is how you format stuff when you know how wide you ...