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Add a reference column migration in Rails 4
...olumn to the uploads table that references the user . What should the migration look like?
7 Answers
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Rails has_and_belongs_to_many migration
...e two models restaurant and user that I want to perform a has_and_belongs_to_many relationship.
4 Answers
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tmux set -g mouse-mode on doesn't work
I've been looking around and people say that putting
8 Answers
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Memoization in Haskell?
Any pointers on how to solve efficiently the following function in Haskell, for large numbers (n > 108)
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How to terminate a window in tmux?
...window in tmux? Like the Ctrl a k shortcut in screen with Ctrl a being the prefix.
10 Answers
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Why use apparently meaningless do-while and if-else statements in macros?
In many C/C++ macros I'm seeing the code of the macro wrapped in what seems like a meaningless do while loop. Here are examples.
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pretty-print JSON using JavaScript
...an I display JSON in an easy-to-read (for human readers) format? I'm looking primarily for indentation and whitespace, with perhaps even colors / font-styles / etc.
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How can I split a string into segments of n characters?
As the title says, I've got a string and I want to split into segments of n characters.
12 Answers
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What does “coalgebra” mean in the context of programming?
I have heard the term "coalgebras" several times in functional programming and PLT circles, especially when the discussion is about objects, comonads, lenses, and such. Googling this term gives pages that give mathematical description of these structures which is pretty much incomprehensible to me. ...
What is the difference between 'E', 'T', and '?' for Java generics?
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Well there's no difference between the first two - they're just using different names for the type parameter (E or T).
The third isn't a valid declaration - ? is used as a wildcard which is used when providing a type argument, e.g. List<?> foo = ... means that foo refers to a list of s...