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How do you detect Credit card type based on number?
I'm trying to figure out how to detect the type of credit card based purely on its number. Does anyone know of a definitive, reliable way to find this?
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TCP: can two different sockets share a port?
This might be a very basic question but it confuses me.
5 Answers
5
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What to use as an initial version? [closed]
I usually start my projects with a version 1.0.0. As soon as I have some stuff together, I release it as 1.0.0 and move on with 1.1.0.
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How do I list all versions of a gem available at a remote site?
I'm trying to find out all the remotely available versions of a specified gem.
4 Answers
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Any reason not to use '+' to concatenate two strings?
A common antipattern in Python is to concatenate a sequence of strings using + in a loop. This is bad because the Python interpreter has to create a new string object for each iteration, and it ends up taking quadratic time. (Recent versions of CPython can apparently optimize this in some cases, b...
Looping in a spiral
A friend was in need of an algorithm that would let him loop through the elements of an NxM matrix (N and M are odd). I came up with a solution, but I wanted to see if my fellow SO'ers could come up with a better solution.
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What does the ^ operator do in Java?
What function does the ^ (caret) operator serve in Java?
17 Answers
17
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Understanding “randomness”
I can't get my head around this, which is more random?
28 Answers
28
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How to validate an email address in JavaScript
Is there a regular expression to validate an email address in JavaScript?
95 Answers
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What does numpy.random.seed(0) do?
What does np.random.seed do in the below code from a Scikit-Learn tutorial? I'm not very familiar with NumPy's random state generator stuff, so I'd really appreciate a layman's terms explanation of this.
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