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How to automatically install Emacs packages by specifying a list of package names?

...a list of package names in .emacs file and then package could automatically search and install the packages, so that I don't need to install them manually by calling M-x package-list-packages . How to do that? ...
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Using python map and other functional tools

...earn. A fundamental rule in functional programming is that every time you call a function with the same arguments, you ALWAYS get the same output. This avoids a vipers nest of bugs introduced by having global state. As maptest depends on an external definition of bars, this principle is broken. ...
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Avoiding instanceof in Java

...is entry from Steve Yegge's Amazon blog: "when polymorphism fails". Essentially he's addressing cases like this, when polymorphism causes more trouble than it solves. The issue is that to use polymorphism you have to make the logic of "handle" part of each 'switching' class - i.e. Integer etc. in ...
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C# Object Pooling Pattern implementation

...ctPool type, which is used to pool frequently used objects which would normally get new'ed up and garbage collected very often. This reduces the amount and size of garbage collection operations which have to happen. There are a few different sub-implementations all using ObjectPool (See: Why are the...
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How do I wait for an asynchronously dispatched block to finish?

...ly even if runSomeLongOperationAndDo: decides that the operation isn't actually long enough to merit threading and runs synchronously instead. share | improve this answer | f...
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Get nested JSON object with GSON using retrofit

I'm consuming an API from my android app, and all the JSON responses are like this: 12 Answers ...
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check if a std::vector contains a certain object? [duplicate]

Is there something in <algorithm> which allows you to check if a std:: container contains something? Or, a way to make one, for example: ...
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Do you debug C++ code in Vim? How? [closed]

The question is to all you people, who use Vim to develop C++ applications. 9 Answers ...
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How to activate virtualenv?

... virtualenv venv --distribute New python executable in venv/bin/python Installing distribute.........done. Installing pip................done. $ source venv/bin/activate (venv)$ python share | impr...
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Comet and jQuery [closed]

...p of jQuery? If not, are there any good implementations of this pattern at all? And regardless of the answer to those questions, is there any documentation on this pattern from an implementation stand-point? ...