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How can I count occurrences with groupBy?
...party library, you can use the Collectors2 class in Eclipse Collections to convert the List to a Bag using a Stream. A Bag is a data structure that is built for counting.
Bag<String> counted =
list.stream().collect(Collectors2.countBy(each -> each));
Assert.assertEquals(1, counted...
Multi-key dictionary in c#? [duplicate]
I know there isn't one in the BCL but can anyone point me to a good opensource one?
16 Answers
...
Cannot delete directory with Directory.Delete(path, true)
...the comments for this answer, and other answers to this question.
I ran into this problem before.
The root of the problem is that this function does not delete files that are within the directory structure. So what you'll need to do is create a function that deletes all the files within the dire...
Getting a better understanding of callback functions in JavaScript
... this enhance performance? This is like checking the type, checking if the converted boolean returns true and then checking its type again and testing it against the string... Could you explain why?
– headacheCoder
Oct 21 '13 at 12:41
...
Java: Check if enum contains a given string?
...ontain many values, perhaps builda HashSet or similar of your enum values converted to a string and query that HashSet instead.
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Set database from SINGLE USER mode to MULTI USER
...ter
GO
DECLARE @kill varchar(8000) = '';
SELECT @kill = @kill + 'kill ' + CONVERT(varchar(5), spid) + ';'
FROM master..sysprocesses
WHERE dbid = db_id('<yourDbName>')
EXEC(@kill);
Then immediately after (in second query window):
USE master ALTER DATABASE <yourDbName> SET OFFLINE WI...
R: += (plus equals) and ++ (plus plus) equivalent from c++/c#/java, etc.?
...ement operator was introduced to make job for compiler easier, as it could convert the code to those machine language instructions directly.
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fol...
Default filter in Django admin
...value() is None:
return queryset.filter(status=5)
elif int(self.value()) == 0:
return queryset.filter(status__lte=4)
elif int(self.value()) == 8:
return queryset.all()
elif int(self.value()) >= 5:
return queryset.filter(statu...
Unnamed/anonymous namespaces vs. static functions
...static keyword applied to entity declared in namespace scope specifies its internal linkage. Entity declared in anonymous namespace has external linkage (C++/3.5) however it is guaranteed to live in uniquely named scope. This anonymity of unnamed namespace effectively hides its declaration making i...
How do you reindex an array in PHP?
...like Gumbo posted.
However, to answer your question, this function should convert any array into a 1-based version
function convertToOneBased( $arr )
{
return array_combine( range( 1, count( $arr ) ), array_values( $arr ) );
}
EDIT
Here's a more reusable/flexible function, should you desire...