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Creating Robust Functions
Before we continue, its best to first describe what we consider to be a
robust function. A robust function, in our view, is one that can accept any
number of parameters, as opposed to a "normal" function, where the number of
parameters accepted is preset, and cannot be altered. Lets get started,
shall we?
 Quick overview of a
"normal" function
There are, in general, two kinds of functions in JavaScript-
ones with no parameters, and ones with. The below shows an example of each:
//function with no parameters
function sayhello(){
alert("hello")
}
//function with one parameters
function saywhat(word){
alert(word)
}
The first function simply blindly yells out "hello" when we
call it; the second one's a little more sophisticated, and says whatever we
put into its mouth...uh, parameter. A function by no means have to have
simply one parameter. It could have 2, or 3, or even a hundred. Having said that, an obvious limitation to normal functions
arise. A function could have 1, 2, 3, or even a hundred parameters, but it
can't
have it all. It has to pick one- "Do I want 2 parameters, or a hundred? Do I
want butter with my toast, or jam?" Once a function is set to accept 2
parameters, shooving in a hundred will cause it to explode. Definitely not
what you want, unless you're goal is to make a JavaScript bomb. Here comes
the arguments array to the rescue!
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