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What's the state of the art in email validation for Rails?
What are you using to validate users' email addresses, and why?
13 Answers
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Shorten string without cutting words in JavaScript
I'm not very good with string manipulation in JavaScript, and I was wondering how you would go about shortening a string without cutting any word off. I know how to use substring, but not indexOf or anything really well.
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How to remove leading and trailing whitespace in a MySQL field?
I have a table with two fields (countries and ISO codes):
11 Answers
11
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NumPy: function for simultaneous max() and min()
numpy.amax() will find the max value in an array, and numpy.amin() does the same for the min value. If I want to find both max and min, I have to call both functions, which requires passing over the (very big) array twice, which seems slow.
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What optimizations can GHC be expected to perform reliably?
...ut I don't know what they all are, nor how likely they are to be performed and under what circumstances.
3 Answers
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What's a concise way to check that environment variables are set in a Unix shell script?
...(an empty string) is OK — not exactly what you want, but the alternative and older notation.
The second variant (using :?) requires DEST to be set and non-empty.
If you supply no message, the shell provides a default message.
The ${var?} construct is portable back to Version 7 UNIX and the Bourne ...
How to get the nvidia driver version from the command line?
For debugging CUDA code and checking compatibilities I need to find out what nvidia driver version for the GPU I have installed. I found How to get the cuda version? but that does not help me here.
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When to use virtual destructors?
I have a solid understanding of most OOP theory but the one thing that confuses me a lot is virtual destructors.
17 Answe...
What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
...s how unqualified names are looked up by the compiler in C++.
The C++11 standard § 3.4.2/1 states:
When the postfix-expression in a function call (5.2.2) is an unqualified-id, other namespaces not considered during the usual unqualified lookup (3.4.1) may be searched, and in those namespaces, ...
Generate list of all possible permutations of a string
...about generating a list of all possible permutations of a string between x and y characters in length, containing a variable list of characters.
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