Nov 25, 2014 · I have seen the use of %>% (percent greater than percent) function in some packages like dplyr and rvest. What does it mean? Is it a way to write closure blocks in R?

Mar 3, 2015 · 508 It's all about variable scoping. Variables declared in the self executing function are, by default, only available to code within the self executing function. This allows code to be written without concern of how variables are named in other blocks of JavaScript code. For example, as mentioned in a comment by Alexander:

Dec 29, 2023 · The identifier __func__ is implicitly declared by the translator as if, immediately following the opening brace of each function definition, the declaration static const char __func__[] = "function-name"; appeared, where function-name is the name of the lexically-enclosing function. This name is the unadorned name of the function.

Note that these functions, unlike tryCatch(), are expected to wrap a function, not an expression, and they return a modified function. For OP's problem as stated, we would probably use possibly and wrap readLines directly to modify it.

356 Function pointers in C can be used to perform object-oriented programming in C. For example, the following lines is written in C: String s1 = newString(); s1->set(s1, "hello"); Yes, the -> and the lack of a new operator is a dead give away, but it sure seems to imply that we're setting the text of some String class to be "hello".

Aug 19, 2015 · Is there a preferred way to return multiple values from a C++ function? For example, imagine a function that divides two integers and returns both the quotient and the remainder. One way I common...

Aug 19, 2010 · 160 coalesce is supported in both Oracle and SQL Server and serves essentially the same function as nvl and isnull. (There are some important differences, coalesce can take an arbitrary number of arguments, and returns the first non-null one.

May 5, 2009 · A callback function is a function which is: accessible by another function, and is invoked after the first function if that first function completes A nice way of imagining how a callback function works is that it is a function that is " called at the back " of the function it is passed into. Maybe a better name would be a "call after" function.

This function below doesn’t work like I want it to; being a JS novice I can’t figure out why. I need it to wait 5 seconds before checking whether the newState is -1. Currently, it doesn’t wait, i...

In C++, when and how do you use a callback function? EDIT: I would like to see a simple example to write a callback function.