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Is it better in C++ to pass by value or pass by constant reference?
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It used to be generally recommended best practice1 to use pass by const ref for all types, except for builtin types (char, int, double, etc.), for iterators and for function objects (lambdas, classes deriving from std::*_function).
This was es...
End of support for python 2.7?
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@Basic welll... that share is pretty slim: 25 over all python versions (4% code exec): cvedetails.com/product/18230/Python-Python.html?vendor_id=10210 vs php with 408 (27% code exec): cvedetails.com/product/128/PHP-PHP.html?vendor_id=74 or Java with 438 (3% code exec): cvede...
If my interface must return Task what is the best way to have a no-operation implementation?
...mprove performance even more if you cache the already completed task since all instances of completed tasks are the same:
public static class TaskExtensions
{
public static readonly Task CompletedTask = Task.FromResult(false);
}
With TaskExtensions.CompletedTask you can use the same instance ...
How to save an image to localStorage and display it on the next page?
So, basically, I need to upload a single image, save it to localStorage, then display it on the next page.
7 Answers
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what does the __file__ variable mean/do?
I usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.
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ab load testing
...While ab runs, there will be -c clients hitting the site. This is what actually decides the amount of stress your site will suffer during the benchmark.
-n: Indicates how many requests are going to be made. This just decides the length of the benchmark. A high -n value with a -c value that your ser...
string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
...ite
space besides empty string.
The term “white space” includes all characters that are not visible on
screen. For example, space, line break, tab and empty string are white
space characters*.
Reference : Here
For performance, IsNullOrWhiteSpace is not ideal but is
good. The ...
Parse an HTML string with JS
...ef='test2'>test03</a></body></html>");
$('a', el) // All the anchor elements
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SignalR: Why choose Hub vs. Persistent Connection?
...persistent connections.
From the highly up-voted comment below:
Partially correct. You can get topics or groups in persistent connections as well. The big difference is dispatching different types of messages. For example you have different kinds of messages and you want to send different kind...
What is the meaning of “$” sign in JavaScript
...of $ in JavaScript. $ is simply a valid JavaScript identifier.
JavaScript allows upper and lower letters, numbers, and $ and _. The $ was intended to be used for machine-generated variables (such as $0001).
Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or f...