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What is Rack middleware?
What is Rack middleware in Ruby? I couldn't find any good explanation for what they mean by "middleware".
9 Answers
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PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?
I did a lot of searching and also read the PHP $_SERVER docs . Do I have this right regarding which to use for my PHP scripts for simple link definitions used throughout my site?
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What does the star operator mean, in a function call?
What does the * operator mean in Python, such as in code like zip(*x) or f(**k) ?
5 Answers
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What is the difference between Raising Exceptions vs Throwing Exceptions in Ruby?
Ruby has two different exceptions mechanisms: Throw/Catch and Raise/Rescue.
3 Answers
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What are the mechanics of short string optimization in libc++?
This answer gives a nice high-level overview of short string optimization (SSO). However, I would like to know in more detail how it works in practice, specifically in the libc++ implementation:
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What is the difference between javac and the Eclipse compiler?
Is Eclipse's Java compiler just a wrapper around the same core that the javac program is wrapped around, or is it a separate compiler altogether? If the latter, why would they reinvent the wheel?
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Difference between len() and .__len__()?
Is there any difference between calling len([1,2,3]) or [1,2,3].__len__() ?
4 Answers
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Convert .pem to .crt and .key
Can anyone tell me the correct way/command to extract/convert the certificate .crt and private key .key files from a .pem file? I just read they are interchangable, but not how.
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Best way to get child nodes
I was wondering, JavaScript offers a variety of methods to get the first child element from any element, but which is the best? By best, I mean: most cross-browser compatible, fastest, most comprehensive and predictable when it comes to behaviour. A list of methods/properties I use as aliases:
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Regular expression that matches valid IPv6 addresses
I'm having trouble writing a regular expression that matches valid IPv6 addresses, including those in their compressed form (with :: or leading zeros omitted from each byte pair).
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