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How do I execute a program using Maven?
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In order to execute multiple programs, I also needed a profiles section:
<profiles>
<profile>
<id>traverse</id>
<activation>
<property>
<name>traverse</name>...
Rails “validates_uniqueness_of” Case Sensitivity
...hreaded server. That's because you might get this sequence of events (the order is important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the n...
How to use the new affix plugin in twitter's bootstrap 2.1.0?
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The data-offset-top value is the amount of pixels that you must scroll in order for the affixing effect to take place. In your case, once 50px is scrolled, the class on your item is changed from .affix-top to .affix. You'd probably want to set data-offset-top to about 130px in your use case.
Once ...
What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...xception in your code, this code will not catch it:
begin
rescue
end
In order to catch the Exception you will have to do this:
begin
rescue Exception
end
This means that in a sense, an Exception is a "worse" error than a RuntimeError, because you have to do more work to recover from it.
So wh...
How do I strip non alphanumeric characters from a string and keep spaces?
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In this case I would use the bang method (gsub! instead of gsub) in order to clean the input permanently.
#permanently filter all non-alphanumeric characters, except _
@search_query.gsub!(/\W/,'')
This avoids a situation where @seach_query is used elsewhere in the code without cleaning it...
How do you get the logical xor of two variables in Python?
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Also, there's a difference between a three-way XOR vs. order-of-operations-grouped set of two XORs. So 3-WAY-XOR(A,B,C) is not the same thing as XOR(XOR(A,B),C). And ddaa's example is the former, while yours assumes the latter.
– ely
Oct 23 ...
How to emulate GPS location in the Android Emulator?
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Mind the order, lon before lat!
– Christoph
Apr 14 '14 at 21:48
15
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How to call function of one php file from another php file and pass parameters to it?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Why does Python code use len() function instead of a length method?
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len, str, etc. can be used with higher-order functions like map, reduce, and filter without the need to define a function or lambda just to call a method. Not everything revolves around OOP, even in Python.
– Evicatos
Nov 7 '...
Preview layout with merge root tag in Intellij IDEA/Android Studio
...: Both android:layout_width and android:layout_height must be specified in order for the layout to display properly in the editor.
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