Returning Values from Function

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Passing values to JavaScript Function

Returning Values from Function

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Author : Exforsys Inc. Published on: 5th Jun 2007 | Last Updated on: 21st Jan 2009

Passing values to JavaScript Function

Returning Values from Function:

After executing the function, there may be situations where the programmer wants to return some value from the function to the calling program. This is achieved by using the return statement in JavaScript.

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The general syntax of this return statement is as follows:

return variablename

An example to understand this concept:

Suppose the programmer wants to create a function with name exforsys, which takes two values x and y. The function is written to add these values and return the result of the addition to the calling program. This is achieved in JavaScript as follows:

function exforsys(x,y)
{
z=x+y
return z
}

Thus, in the above example, the added value x+y is stored in variable z and returned to the calling program using the statement

return z

In the calling program, suppose the values passed to the function from the calling program are 10 and 15. From the calling program, the function is called as follows:

result=exforsys(10,15)

The returned value z is the addition of two values x and y of the function exforsys . This is stored in the variable result in the calling program.

A complete example of a function in JavaScript:

<html>
<head>
<script type="text/javascript">
function exforsys(x,y)
{
return x+y
}
script>
head>

<body>
<script type="text/javascript">
document.write(exforsys(10,15))
script>
body>
html>

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The output of the above program is

25

Thus, in the above example, the function creation is done on the <head> section of the program. The function exforsys is called with values 10 and 15 passed to the function and the added value 25 is returned from the function using the return statement. This is stored in the function name exforsys and then printed in the calling program.

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