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Rails respond_with: how does it work?
... Rails 3. But I can't even find a reference to it in either the Rails APIs or by searching the source. Can anyone either explain to me how it works (what options you can use, etc) or point me to the place it's actually implemented so I can peruse the code on my own?
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Short description of the scoping rules?
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Actually, a concise rule for Python Scope resolution, from Learning Python, 3rd. Ed.. (These rules are specific to variable names, not attributes. If you reference it without a period, these rules apply.)
LEGB Rule
Local — Names assigned in any w...
cscope or ctags why choose one over the other? [closed]
I primarily use vim / gvim as an editor and am looking at using a combination of lxr (the Linux Cross Reference) and either cscope or ctags for exploring the kernel source. However, I haven't ever used either cscope or ctags and would like to hear why one might choose one over the other t...
How to pass the value of a variable to the stdin of a command?
...secure data through parameters of commands and preferably does not use temporary files. How can I pass a variable to the stdin of a command? Or, if it's not possible, how to correctly use temporary files for such task?
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OO Design in Rails: Where to put stuff
... and I enjoy Ruby being very OO. Still, the tendency to make huge ActiveRecord subclasses and huge controllers is quite natural (even if you do use a controller per resource). If you were to create deeper object worlds, where would you put the classes (and modules, I suppose)? I'm asking about views...
Why have header files and .cpp files? [closed]
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Well, the main reason would be for separating the interface from the implementation. The header declares "what" a class (or whatever is being implemented) will do, while the cpp file defines "how" it will perform those features.
This reduces dependencies ...
Set value of textarea in jQuery
...ake sure the value you're setting is a string, and attr seems to do a bit more magic overall.
– enobrev
Jan 6 '09 at 6:31
63
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Test if a command outputs an empty string
...iously, the question asked how to check whether there are files in a directory. The following code achieves that, but see rsp's answer for a better solution.
Empty output
Commands don’t return values – they output them. You can capture this output by using command substitution; e.g. $(ls -A...
How to handle floats and decimal separators with html5 input type number
Im building web app which is mainly for mobile browsers. Im using input fields with number type, so (most) mobile browsers invokes only number keyboard for better user experience. This web app is mainly used in regions where decimal separator is comma, not dot, so I need to handle both decimal separ...
Difference between SPI and API?
...l.
Put differently, the API tells you what a specific class/method does for you, and the SPI tells you what you must do to conform.
Usually API and SPI are separate. For example, in JDBC the Driver class is part of the SPI: If you simply want to use JDBC, you don't need to use it directly, but ev...