Cross Ref > Language Details

Languages Focus

For non-OOP languages, a custom routine is a function, procedure, or subroutine and for pure OOP languages, a custom routine is a class method. Hybrid languages (both non-OOP and OOP) combine both.

C#:  C# requires () in both the function declaration, and when it's invoked. Leave off the parens to signify a property. ReturnType RoutineName() Syntax Example: void SayHello(String pName) { MessageBox.Show("Hello " + pName); } int Add(int a, int b) { return a + b; }

JavaScript:   function JavaScript uses functions and loosely typed parameters. Function definitions must come before their usage so the usual preference when adding JavaScript to HTML pages is to include them between the head tags. Syntax Example: function SayHello(pName) {  document.write("Hello " + pName + "<br>"); } function add(p1, p2) {  var result;    result = p1 + p2;  return result; }  JavaScript Custom Routines (function)

In computer programming, an event handler is part of event driven programming where the events are created by the framework based on interpreting inputs. Each event allows you to add code to an application-level event generated by the underlying framework, typically GUI triggers such as a key press, mouse movement, action selection, and an expired timer. In addition, events can represent data changes, new data, etc. Specifically, an event handler is an asynchronous callback subroutine that handles inputs received in a program.

A custom event is a programmer created event. For example, you can contrast an event handler with a member event, an OOP concept where you add an event to a class.

Languages Focus

Many development environments and compilers provide for event driven programming, a standard set of application events such as startup, end, on click of a button, etc. This section documents the applicaton event handler or an overview for each language.

For OOP languages, do not confuse this section with class member events discussed in the OOP Details section of our Cross Reference Coding Encyclopedia.

[Not specified yet. Coming...]

JavaScript:  The JavaScript event handler contains events centered around the Document Object Model (DOM). Common events include onMouseOver and onMouseOut, onFocus and onBlur, onClick and onDblClick, onChange and onSelect, onLoad and onUnload. For example, onMouseOver and onMouseOut are frequently used with websites to change an image when your mouse moves over it. The onClick event is used to trigger code upon a mouse click. Syntax Example: In the following example, we use a standard image tag set to an image, change it on mouse over, then set it back on mouse out. <img id="Image1" src="i_search.gif" onmouseover="document.images['Image1'].src='i_coat.gif';" onmouseout="document.images['Image1'].src='i_search.gif';">  JavaScript Event Model

Languages Focus

Also known as embedded code where you embed another syntax language within the native code of the development environment you are using. The inline code can be compiled by the current development's compiler or by an external compiler.

Do not confuse with inlining which is a coding technique where custom routines are moved inline where the code is executed either by you, by a compiler directive, or automatically by the compiler.

C#:   Not Supported Since all the .Net languages compile into intermediate language (IL), and not to a specific CPU, they do not provide support for inline assembler code.

[Not specified yet. Coming...]

General Info: Inline Routines

Instead of calling a routine, you move the code from the routine itself and expand it in place of the call. In addition to manual inlining, some languages support automatic inlining where the compiler or some other pre-compiler decides when to inline a code routine. Also, some languages allow for developer defined inlining where the developer can suggest and/or force the inlining of a code routine. Inlining can optimize your code for speed by saving a call and return, and parameter management.

Languages Focus

Does it support inlining? If so, does it support developer defined inlining? Does it support automatic inlining? Both?

C#:   Automatic In C#, inlining is automatically done for you by the JIT compiler for all languages and in general leads to faster code for all programmers whether they are aware of inlining or not. More Info / Comment	JavaScript:   Not Supported

Types of overloading include method overloading and operator overloading.

Method Overloading is where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism.

Operater Overloading allows an operator to behave differently based on the types of values used. For example, in some languages the + operator is used both to add numbers and to concatenate strings. Custom operator overloading is sometimes referred to as ad-hoc polymorphism.

C#:   implicit C# supports both method and operator overloading. For methods, C# supports implicit overloading (no need for an overload keyword).  C# Overloading (implicit)	JavaScript:  JavaScript Overloading Operator - No. Method - Syntax Example:    JavaScript Overloading