JavaScript Function

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JavaScript Function

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A function is an assignment that JavaScript can take care of for you. It is a technique used to isolate a group of instructional code so that other parts of the application can depend on it to provide them with a reliable result. There are two main categories of functions you will be using in JavaScript: those that have already been created for you and those you create in your code.

Defining Functions

JavaScript functions are defined by using the key word "function" followed by its name and variables being passed to it in the following syntax:

Syntax

function fname(value1,value2, ...)
{
statement1
statement2
.
}

Example:1

<HTML>
<HEAD>
<TITLE>A function definition</TITLE>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</BODY>
</HTML>
.
}

Calling Functions

If evaluate() is a defined function, the following line will call the function:

<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>

This function may evaluated the members of the array tree to see how many match a certain criteria.

Another way to call a function is to tie it to an anchor:

<A HREF="javascript:redirectLink()">redirecting</A>

Or

<NAME="javatest" onClick="redirectLink()">redirecting</A>

Functions Properties

Functions in JavaScript is actually an object. Therefore any created function created using the "function" declaration will have the properties of a function. These properties are:

Argument - An array of arguments passed to the function. This is an array object which has a property of length which enables the programmer to tell how many arguments (or variables) are passed to the function.

Caller - The name of the function that called the function.

Prototype - Used to make more properties.

The return Statement

The return statements are used to specify the value that is returned from the functions.

So, functions that are going to return a value must use the return statement.

Example:2

The function below should return the product of two numbers (a and b):

function prod(a,b)
     {
       x=a*b
       return x
     }

When you call the function above, you must pass along two parameters:

product=prod(2,3)

The returned value from the prod() function is 6, and it will be stored in the variable called product.

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