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How do you rotate a two dimensional array?
...al number of layers in the matrix. This occurs when the innermost layer is formed of only one element (i.e. a 1×1 matrix) and therefore need not be rotated. It simply gets ignored.
We will undoubtedly need this information in our function to rotate a matrix, so let’s add it now:
def rotate(matr...
How can I efficiently select a Standard Library container in C++11?
...hen several choices are available, go for the simplest
Worrying about performance is usually useless at first. The big O considerations only really kick in when you start handling a few thousands (or more) of items.
There are two big categories of containers:
Associative containers: they have a...
How using try catch for exception handling is best practice
...
For a UI application: to pop it to the user with an apology message (winforms)
For a Service or a Console application: log it to a file (service or console)
Then I always enclose every piece of code that is run externally in try/catch :
All events fired by the Winforms infrastructure (Load, ...
What is a mixin, and why are they useful?
...iple inheritance? Is it just a matter of semantics?
A mixin is a limited form of multiple inheritance. In some languages the mechanism for adding a mixin to a class is slightly different (in terms of syntax) from that of inheritance.
In the context of Python especially, a mixin is a parent class ...
How efficient can Meteor be while sharing a huge collection among many clients?
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Differences between Java 8 Date Time API (java.time) and Joda-Time
...although latter is not type-safe at all due to excessive use of ints).
Performance
See the other answer by @OO7 pointing to the analysis of Mikhail Vorontsov although point 3 (exception catching) is probably obsolete - see this JDK-bug. The different performance (which is in general favour of JSR-...
JSTL in JSF2 Facelets… makes sense?
...ributes depend on results of JSF events such as preRenderView or submitted form values in the model which aren't available during view build time. So, use JSTL tags only to control flow of JSF component tree building. Use JSF UI components to control flow of HTML output generation. Do not bind the v...
How useful/important is REST HATEOAS ( maturity level 3)?
...is API. This second client violates the HATEOAS ideas and has hard-coded information about the resources. It displays a car and a house in different ways.
Can the API still be called RESTful? I think so. It is not the API's fault that one of its clients has violated HATEOAS.
I advise to build REST...
What is an optional value in Swift?
...It's either nil or it's "Bob". This is not true, the optional doesn't transform into something else. Comparing it to nil is a trick to make easier-to-read code. If an optional equals nil, this just means that the enum is currently set to .none.
Only optionals can be nil
If you try to set a non-opti...
What are the differences between concepts and template constraints?
...
The following information is out of date. It needs to be updated according to the latest Concepts Lite draft.
Section 3 of the constraints proposal covers this in reasonable depth.
The concepts proposal has been put on the back burners fo...