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When do you need to explicitly call a superclass constructor?
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141
You never need just
super();
That's what will be there if you don't specify anything else. ...
Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
...essing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way to do this is to use TryGetValue
obj item;
if(!dict.TryGetValue(name, out item))
return null;
return item;
This accesses the dictionary only once instead of twice.
If you really want...
Is there a 'box-shadow-color' property?
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138
No:
http://www.w3.org/TR/css3-background/#the-box-shadow
You can verify this in Chrome and F...
What's the standard way to work with dates and times in Scala? Should I use Java types or there are
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130
From Java SE 8 onwards, users are asked to migrate to java.time (JSR-310). There are efforts o...
How to get a URL parameter in Express?
...issue on getting the value of tagid from my URL: localhost:8888/p?tagid=1234 .
4 Answers
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What does the 'L' in front a string mean in C++?
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141
It's a wchar_t literal, for extended character set. Wikipedia has a little discussion on this ...
What is the documents directory (NSDocumentDirectory)?
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197
Your app only (on a non-jailbroken device) runs in a "sandboxed" environment. This means that ...
Python idiom to return first item or None
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216
Python 2.6+
next(iter(your_list), None)
If your_list can be None:
next(iter(your_list or []...
How to navigate through the source code by parts in CamelCase (instead of whole words)?
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391
Yes, enable Use "CamelHumps" words in Settings | Editor | General | Smart Keys.
...
What is the difference between an ORM and an ODM?
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178
MySQL is an example of a relational database - you would use an ORM to translate between your ...