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Applicatives compose, monads don't
...t;- mb
if b then mt else mf
which uses the result of some effect to decide between two computations (e.g. launching missiles and signing an armistice), whereas
iffy :: Applicative a => a Bool -> a x -> a x -> a x
iffy ab at af = pure cond <*> ab <*> at <*> af where...
Search an Oracle database for tables with specific column names?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f1953239%2fsearch-an-oracle-database-for-tables-with-specific-column-names%23new-answer', 'question_page');
}
);
...
How to iterate through range of Dates in Java?
...ff with java.util.Date instances like below:
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Date startDate = formatter.parse("2010-12-20");
Date endDate = formatter.parse("2010-12-26");
Here's the legacy java.util.Calendar approach in case you aren't on Java8 yet:
Calendar star...
Split column at delimiter in data frame [duplicate]
...
The newly popular tidyr package does this with separate. It uses regular expressions so you'll have to escape the |
df <- data.frame(ID=11:13, FOO=c('a|b', 'b|c', 'x|y'))
separate(data = df, col = FOO, into = c("left", "right...
What does “yield break;” do in C#?
...public class NodeWithTenChildren : INode
{
private Node[] m_children = new Node[10];
public IEnumerable<Node> GetChildren()
{
for( int n = 0; n < 10; ++n )
{
yield return m_children[ n ];
}
}
}
public class NodeWithNoChildren : INode
{
...
get NSDate today, yesterday, this Week, last Week, this Month, last Month… variables
...inition of NSWeekdayCalendarUnit and NSDayCalendarUnit around iOS 5.0. The new way is to use NSWeekdayCalendarUnit. But on older versions you must use NSDayCalendarUnit. It is a mess...
– Dustin
Jun 5 '13 at 0:22
...
Convert character to ASCII code in JavaScript
...
Just for the beauty a new ES6 way to write it: const ascii = a => a.charCodeAt(0);
– axkibe
Nov 29 '17 at 9:10
...
phpmyadmin logs out after 1440 secs
...instead of putting the first line in phpmyadmin/config.inc.php put it in a new file in the directory phpmyadmin/conf.d so that it won't be overwritten on an upgrade
– zelcon
Mar 22 '16 at 20:45
...
'IF' in 'SELECT' statement - choose output value based on column values
...necessarily appropriate if there are other values for report.type, or if a new report.type is introduced at a later date. It's saying if report.type = 'P' use amount, otherwise use -amount for anything else. it won't consider the type if it's not 'P'.
– BadHorsie
...
How do I call a dynamically-named method in Javascript?
...
this.abc = function() {
alert("abc");
}
}
var myObject = new MyClass();
myObject["abc"]();
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