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When to use nil, blank, empty? [duplicate]
Is there any guidelines on how to differentiate between .nil? , .blank? and .empty? ?
4 Answers
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Is it true that one should not use NSLog() on production code?
...mber to make it easier to track down log statements.
#define DEBUG_MODE
#ifdef DEBUG_MODE
#define DebugLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, [NSString stringWithFormat:(s), ##__VA_ARGS__] )
#else
#define...
What is “Orthogonality”?
...t instruction happens (very important for debugging).
There is also a specific meaning when referring to instruction sets.
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XPath: How to check if an attribute exists?
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Short and sweet:
//*[@foo]
Of course you should use a more specific expression. But with [@attributeName] you get all nodes which have that attribute.
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Is there a function to deselect all text using JavaScript?
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Try this:
function clearSelection()
{
if (window.getSelection) {window.getSelection().removeAllRanges();}
else if (document.selection) {document.selection.empty();}
}
This will clear a selection in regular HTML content in any major browser. It won't clear a se...
Why can't I access DateTime->date in PHP's DateTime class?
Using the DateTime class, if I try to run the following code:
5 Answers
5
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How to initialize a private static const map in C++?
...;< A::myMap[1]; into main(). It gives an error. The error doesn't occur if I remove the const qualifiers, so I guess map's operator[] can't handle a const map, at least, not in the g++ implementation of the C++ library.
– Craig McQueen
Oct 31 '13 at 1:08
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Invalidating JSON Web Tokens
...t on context).
3) Just keep token expiry times short and rotate them often
If you keep the token expiry times at short enough intervals, and have the running client keep track and request updates when necessary, number 1 would effectively work as a complete logout system. The problem with this metho...
My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
...d learned a lot from them. Some of the questions I read are related to specific implementation challenges while others focus on general concepts. I just want to make sure I understood all of the concepts and the reasoning why technology X was invented over technology Y and so on. So here goes:
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Check for changes to an SQL Server table?
...an SQL Server database for changes to a table without using triggers or modifying the structure of the database in any way? My preferred programming environment is .NET and C#.
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