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Create Directory if it doesn't exist with Ruby

I am trying to create a directory with the following code: 4 Answers 4 ...
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What's the difference between an object initializer and a constructor?

...en the two and when would you use an "object initializer" over a "constructor" and vice-versa? I'm working with C#, if that matters. Also, is the object initializer method specific to C# or .NET? ...
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Align DIV's to bottom or baseline

I'm trying to align a child div tag to the bottom or baseline of the parent div tag. 10 Answers ...
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Javascript regex returning true.. then false.. then true.. etc [duplicate]

I have a strange problem with the validation I am writing on a form. It is a 'Check Username' button next to an input. The input default value is the username for example 'betamax'. When I press 'Check Username' it passes the regex and sends the username to the server. The server behaves as expected...
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Grouping functions (tapply, by, aggregate) and the *apply family

...hat beginning useRs may have difficulty deciding which one is appropriate for their situation or even remembering them all. They may have a general sense that "I should be using an *apply function here", but it can be tough to keep them all straight at first. Despite the fact (noted in other answer...
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How to make CSS width to fill parent?

I am sure this problem has been asked before but I cannot seem to find the answer. 4 Answers ...
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Is AsyncTask really conceptually flawed or am I just missing something?

I have investigated this problem for months now, came up with different solutions to it, which I am not happy with since they are all massive hacks. I still cannot believe that a class that flawed in design made it into the framework and no-one is talking about it, so I guess I just must be missing ...
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Renaming columns in pandas

...ataFrame using pandas and column labels that I need to edit to replace the original column labels. 27 Answers ...
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Run a JAR file from the command line and specify classpath

... file and specified the Main-Class in the manifest (I used the Eclipse Export function). My dependencies are all in a directory labeled lib . I can't seem to get a straight answer on how to execute my JAR file while specifying it should use the lib/* as the classpath. ...
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How to open a file using the open with statement

...s in the file and appending text to the occurrences in the file. The code works. Could it be done better? 4 Answers ...