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Rails 4: before_filter vs. before_action
...ller::Base, before_action is just a new syntax for before_filter.
However all before_filters syntax are deprecated in Rails 5.0 and will be removed in Rails 5.1
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Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
...wer is vastly different. For example cloning an array of listeners before calling each of them. Those arrays are often small, usually 1 element.
– gman
Feb 13 '15 at 2:05
7
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Traits vs. interfaces
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Except that traits are not interfaces at all. Interfaces are specification that can be checked against. Traits cannot be checked against, hence they are implementation only. They are the exact opposite of interfaces. That line in the RFC is simply wrong...
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What is the difference between `sorted(list)` vs `list.sort()`?
...sorts the list in-place, mutating the list indices, and returns None (like all in-place operations).
sorted() works on any iterable, not just lists. Strings, tuples, dictionaries (you'll get the keys), generators, etc., returning a list containing all elements, sorted.
Use list.sort() when you wa...
How do you reference a capture group with regex find and replace in Visual Studio 2012, 2013, 2015,
... questions about this, but none that I found specifically referenced which VS version they referred to. With that important information lacking, I still was unable to successfully use the answers I found. The most common was
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C# if/then directives for debug vs release
...em only executed if a certain symbol is defined. The compiler would remove all calls to those methods if the symbol is not defined:
[Conditional("DEBUG")]
void PrintLog() {
Console.WriteLine("Debug info");
}
void Test() {
PrintLog();
}
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Malloc vs new — different padding
...or high-performance computing (10^5 - 10^6 cores). The code is intended to allow for communications between (potentially) different machines on different architectures. He's written a comment that says something along the lines of:
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What do the terms “CPU bound” and “I/O bound” mean?
...U (doing calculations). A program that computes new digits of π will typically be CPU-bound, it's just crunching numbers.
A program is I/O bound if it would go faster if the I/O subsystem was faster. Which exact I/O system is meant can vary; I typically associate it with disk, but of course networ...
delegate keyword vs. lambda notation
... If you specify an anonymous method without specifying a parameter list at all it is compatible with any delegate type returning void and without any out parameters. Armed with this knowledge, we should be able to construct two overloads to make the expressions completely unambiguous but very differ...
Failed to install Python Cryptography package with PIP and setup.py
When I try to install the Cryptography package for Python through either pip install cryptography or by downloading the package from their site and running python setup.py , I get the following error:
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