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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...rrent connections if the scarce resource is a connection-limited database, etc.).
Another way to put it is: allowing the operating system to interleave the usage of a single resource for two tasks cannot be faster than merely letting one task use the resource while the other waits, then letting the...
How to “properly” create a custom object in JavaScript?
...n larger code bases as developers forget to use new, forget to capitalize, etc. To be pragmatic, you can do everything you need to do without the new keyword - so why use it and introduce more points of failure in the code? JS is a prototypal, not class based, language. So why do we want it to act l...
std::function vs template
... of the calculations of calc1 and calc2 are not the same, due to in-lining etc. Compare for example the sum of all results:
float result=0;
for (int i = 0; i < 1e8; ++i) {
result+=calc2([](float arg){ return arg * 0.5f; });
}
with calc2 that becomes
1.71799e+10, time spent 0.14 sec
while...
How well is Unicode supported in C++11?
...wish for Unicode functionality (number of code points, number of graphemes etc) you are out of luck.
The only comprehensive library I know of for this is ICU. The C++ interface was derived from the Java one though, so it's far from being idiomatic.
...
What is the purpose of setting a key in data.table?
...along with associated information (city, state, population, median income, etc.). If I want to look up the information for a specific zip code, the search (filter) is about 1000 times faster if I setkey(ZIP,zipcode) first.
Another benefit has to do with joins. Suppose a have a list of people and th...
Best explanation for languages without null
...azy null value that is meaningless to the graphing domain I'm working in. Etc.
When you do intend to model a possibly-non-existent value, then you should opt into it explicitly. If the way I intend to model people is that every Person has a FirstName and a LastName, but only some people have Midd...
WebSockets protocol vs HTTP
...ng in real-time, chat, multiplayer games, live online collaboration tools, etc.
You can check out a deep dive article on Websockets which explains the history of this protocol, how it came into being, what it’s used for and how you can implement it yourself.
Here's a video from a presentation I ...
Lock-free multi-threading is for real threading experts
... Most of the classic lock-free structures (lists, queues, concurrent maps, etc) had no spinning even for shared mutable structures, and practical existing implementations of the same in, for example, Java follow the same pattern (I'm not as familiar with what's available in native-compiled C or C++ ...
Referring to the null object in Python
...nd is used to control and test special conditions (e.g. boundaries, state, etc.). Such a value is called a sentinel and it can be used the way None is used as a signal. It's trivial to create a sentinel in Python.
undefined = object()
The undefined object above is unique and doesn't do much of anyt...
What's the difference between “groups” and “captures” in .NET regular expressions?
...avior causes group's specification, like (...)(...), (...){2} or (.{3}){2} etc.
Hopefully it will help shed some light on the differences between Captures, Groups and Matches as well.
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