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What is the meaning of “$” sign in JavaScript
...re's nothing mysterious about the use 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 ...
How to call getClass() from a static method in Java?
... that must have some static methods. Inside these static methods I need to call the method getClass() to make the following call:
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Does Typescript support the ?. operator? (And, what's it called?)
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Update: it is supported as of TypeScript 3.7 and called Optional chaining: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#optional-chaining
I can't find any reference to it whatsoever in the TypeScript language specification.
As far as what...
What's the yield keyword in JavaScript?
...MO.
The function containing the yield keyword is a generator. When you call it, its formal parameters are bound to actual arguments, but its body isn't actually evaluated. Instead, a generator-iterator is returned. Each call to the generator-iterator's next() method performs another pass through...
Multiple inheritance/prototypes in JavaScript
...e first prototype which contains that property, and I return the value, or call the getter on the appropriate receiver. This is handled by Reflect.get. If no prototype contains the property, I return undefined.
The set trap is a trap for setting property values. I use find to find the first prototyp...
Static variable inside of a function in C
...oo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over a...
Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity
...ong is completely unsurprising; the "ambiguous method" error heuristic basically picks any two methods from the candidate set if a best method cannot be determined. It is not very good at finding the "real" ambiguity, if in fact there is one.
One might reasonably ask why that is. It is quite tricky...
What is stack unwinding?
...the scope is of the function func.) This is done by the compiler inserting calls to destructors of automatic (stack) variables.
Now this is a very powerful concept leading to the technique called RAII, that is Resource Acquisition Is Initialization, that helps us manage resources like memory, datab...
what is the basic difference between stack and queue?
...t is the first one to come out. This is LIFO. Adding a piece of paper is called "pushing", and removing a piece of paper is called "popping".
Imagine a queue at the store. The first person in line is the first person to get out of line. This is FIFO. A person getting into line is "enqueued",...
The calling thread cannot access this object because a different thread owns it
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To add my 2 cents, the exception can occur even if you call your code through System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(). The point is that you have to call Invoke() of the Dispatcher of the control that you're trying to access, which in some cases may not be...