ES6 super () in the constructor and prototype methods

I have two questions First : I recently learnt that in ES 6 derived class, if super() is not called, the "this" is not available. I understand why it is done this way, but I want to know conceptually, what piece of ES6 compiled code is making &q

Declaration and difference of prototype

What is the difference between declaration and prototype in C? In which situations they are called declarations and in which prototypes?TL;DR; All prototypes are declarations, but not all declarations are prototypes. Declaration is the generic termin

Why do we need a prototype in operation?

I'm studying C and my book is explaining how to "prototype a function" so we can use it before we define it. The point is that I can't imagine a situation in which is needed to use a function before have defined it, why can't we just define it a

How to make a function visible through a C header file

I have several header files in a library: header1.h, header2.h... I also have a general header file for the library: mylib.h I want the user to import the main.h file and get access to only some of the functions in the other header files. For example

How to return two values ​​of a function?

How do I design a function prototype that would allow a single function to find and return simultaneously both the lowest and the highest values in an array? Thank you.std::pair covers returning two values, std::tuple generalizes to any number of val

Is it possible to check if a function has been declared?

Suppose there's a library, one version of which defines a function with name foo, and another version has the name changed to foo_other, but both these functions still have the same arguments and return values. I currently use conditional compilation

Function declaration vs function definition

If I have this prototype: int bar(int); for the compiler I'm declaring the identifier bar. If I have this definition: int bar(int a) {}; for the compiler I'm defining the identifier bar. Generally speaking a definition make a storage allocation for a

#define EXIT_SUCCESS 0

I was looking at a program that calculates the average of 3 numbers and came across #define EXIT_SUCCESS 0 to make return EXIT_SUCCESS; work without an error (right under the include header). What is the purpose of using #define EXIT_SUCCESS 0 and re

C language - call functions without a function prototype

I found here that function prototype is necessary before function call if the function is below function calling. I checked this case in gcc compiler and it compile code without function prototype. Example: #include <stdio.h> //int sum (int, int); -

C / C ++ need prototypes of local functions?

Is there any advantage on explicitly prototype local functions in C/C++, instead of defining the functions before use? By local I mean functions only used whithin their source file. An example is this: #include "header.h" static float times2(flo

Is there a new function type expression format in C ++ 11?

Today I checked out Stroustrup's C++11 FAQ (modified April 7, 2013) and saw this at the end of the type-alias section: typedef void (*PFD)(double); // C style using PF = void (*)(double); // using plus C-style type using P = [](double)->void; // usin

Crockford's code regarding the constructor's invocation model

The below code is almost identical to some code from Douglas Crockford's superb book JavaScript: The Good Parts, from pages 29-30. The only difference is that he adds the get_status property like so: Quo.prototype.get_status=function() { this.status=

the argument does not match the prototype error on Linux

I have header file with the following function declaration: extern getEmailDetailsResult * getemaildetails_5(getEmailDetailsInput *, CLIENT *); In my .C file, the function definition is getEmailDetailsResult* getemaildetails_5(inputParams, rqstp) get

Put the name of the parameters in the C function prototypes?

When declaring functions in C, you should set a prototype in which you do not need to write the name of parameters. Just with its type is enough. void foo(int, char); My question is, is it a good practice to also include names of parameters?Yes, it's

Inline function prototype vs. regular vs prototype declaration

What's the difference between inline function and then main like so: inline double cube(double side) { return side * side * side; } int main( ) { cube(5); } vs just declaring a function regularly like: double cube(double side) { return side * side *

What should be the prototype of my virtual function?

Let's say I have an abstract base class Base with a virtual function doSomething() There are two derived classes, one of which takes no parameters in doSomething() while the other takes a structure and an integer as a parameter. A function in another

& ldquo; Faking & rdquo; a JavaScript constructor

Context I am working on improving my JavaScript skills and I'm learning more about prototyping. I want to better understand the code in this question and any limitations or problems with it. One thing that hasn't been obvious is defining more complex

Javascript namespace declaration with prototype function

I know, this is often discussed. But after searching around like someone out of the 19th century, I need some advice. I have no problem by declaring a "namespace", but when it comes to a prototype.foo function, I stuck. I found a way, but I don'

Should the returned structure of localtime () be released?

struct tm *localtime(const time_t *timep); I checked man localtime but there's no words on whether it's my duty to clean it after using. And in fact I have many similar doubts on functions returning a pointer, how do you determine it should be freed

Javascript when using prototypes

I'd like to understand when it is appropriate to use prototype methods in js. Should they always be used? Or are there cases where using them is not preferred and/or incurs a performance penalty? In searching around this site on common methods for na

Could not resolve Javascript object method this reference

I've got a JS object I've made, with a few prototypal functions, and calling them from within the constructor is fine, using this.[function] But in a later event handler function, this refers to the element, and not the object, and I'm not sure how t

Should we declare the function prototype in C?

This question already has an answer here: Are prototypes required for all functions in C89, C90 or C99? 6 answers I am kind of new to C (I have prior Java, C#, and some C++ experience). In C, is it necessary to declare a function prototype or can the

prototype functions disable custom functions

Its a complicated senario for me. I have a sound management singleton with an asset like dictionary storing all referances to my urls and assets and the guff inside it- I have a function called addItem(id:String, url:String):Object I would love to do