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How to check if an object is an array?
I'm trying to write a function that either accepts a list of strings, or a single string. If it's a string, then I want to convert it to an array with just the one item so I can loop over it without fear of an error.
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Batch renaming files with Bash
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You could use bash's parameter expansion feature
for i in ./*.pkg ; do mv "$i" "${i/-[0-9.]*.pkg/.pkg}" ; done
Quotes are needed for filenames with spaces.
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Why can I add named properties to an array as if it were an object?
...ry properties on it. This should be considered harmful though. Arrays are for numerically indexed data - for non-numeric keys, use an Object.
Here's a more concrete example why non-numeric keys don't "fit" an Array:
var myArray = Array();
myArray['A'] = "Athens";
myArray['B'] = "Berlin";
alert(my...
Interface or an Abstract Class: which one to use?
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Use an interface when you want to force developers working in your system (yourself included) to implement a set number of methods on the classes they'll be building.
Use an abstract class when you want to force developers working in your system (yourself inc...
How is OAuth 2 different from OAuth 1?
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Eran Hammer-Lahav has done an excellent job in explaining the majority of the differences in his article Introducing OAuth 2.0. To summarize, here are the key differences:
More OAuth Flows to allow better support for non-browser based applications. This is a main criticism against OAuth...
How do I check if a directory exists? “is_dir”, “file_exists” or both?
I want to create a directory if it does'nt exist already.
12 Answers
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Why do we need extern “C”{ #include } in C++?
...expects the data contained in the header file to be compiled to a certain format—the C++ 'ABI', or 'Application Binary Interface', so the linker chokes up. This is preferable to passing C++ data to a function expecting C data.
(To get into the really nitty-gritty, C++'s ABI generally 'mangles' th...
Do python projects need a MANIFEST.in, and what should be in it?
The "Python Distribute" guide (was at python-distribute.org, but that registration has lapsed) tells me to include doc/txt files and .py files are excluded in MANIFEST.in file
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Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?
...eate a "Implicitly Unwrapped Optional" vs creating just a regular variable or constant?
If you know that it can be successfully unwrapped then why create an optional in the first place?
For example, why is this:
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How to find out what group a given user has?
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groups
or
groups user
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