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About declaring variables


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Hi there! I'm a beginner when it comes to programming thats why I want to know what ARE the differences of declaring a variable like this:

function function_name(var1,var2,...,varX)

{

 

some code

 

}

 

TO this:

 

function function_name()

{

 

var1;

var2;

varX;

etc.......

 

some code

}

Edited by jtified
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The difference between the two depends on how you intend to use the Javascript function.

 

When declaring your variables inside the function, like example #2 above, the variable will always hold one particular value. For example,

 

function function_name()
{
var1 = 1;
some code;
}

 

When that variable is inside the function, it will always hold the value of 1 (unless you make changes to the value later in the function).

 

In example #1, the way the javascript is written allows you to give different values to the variables depending on how you call the function. For example,

 

function function_name(var1)
{
some code
}

 

you could call that function, using different values for the variable each time:

 

function_name(2);
function_name(455);

 

In line #1, the "var1" variable would equal 2, and in line 2, it would equal 455.

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