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Error: Can't set headers after they are sent to the client
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The res object in Express is a subclass of Node.js's http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call ...
Make first letter of a string upper case (with maximum performance)
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I took the fastest method from http://www.dotnetperls.com/uppercase-first-letter and converted to extension method:
/// <summary>
/// Returns the input string with the first character converted to uppercase, or mutates any nulls passed into ...
Difference between staticmethod and classmethod
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Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo:
class A(object):
def foo(self, x):
print "executing foo(%s, %s)" % (self, x)
@classmethod
def class_foo(cls, x):
print "executing class_foo(%s, %s...
Is there an IDictionary implementation that, on missing key, returns the default value instead of th
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Indeed, that won't be efficient at all.
You could always write an extension method:
public static TValue GetValueOrDefault<TKey,TValue>
(this IDictionary<TKey, TValue> dictionary, TKey key)
{
TValue ret;
// Ignore return value
dic...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...ble towards the existing object. The docs explain the difference between shallow and deep copies:
The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
class instances):
A shallow copy constructs a new...
Maximum Java heap size of a 32-bit JVM on a 64-bit OS
...the max heap size can be higher, approaching 4G on many Solaris systems.
(http://www.oracle.com/technetwork/java/hotspotfaq-138619.html#gc_heap_32bit)
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Limitations of SQL Server Express
... database size (raised to 10GB in SQL 2008 R2 and SQL 2012) per database
http://www.dotnetspider.com/tutorials/SqlServer-Tutorial-158.aspx
http://www.microsoft.com/sqlserver/2008/en/us/editions.aspx
With regards to the number of databases, this MSDN article says there's no limit:
The 4 GB da...
Camera orientation issue in Android
... This doesn't seem to work on some devices, it returns 0 for all orientations.. I know it happens on Galaxy S Infuse and Sony Xperia Arc, and S II.. Interesting thing here is that when these same images are selected from gallery, the content provider has the proper orientation value.. ...
Vim: apply settings on files in directory
How do I specify Vim settings for all files under the current directory?
11 Answers
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Convert a series of parent-child relationships into a hierarchical tree?
...o '</ul>';
}
}
You'll only save 8 iterations on a dataset as small as this but on bigger sets it could make a difference.
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