programming-for-dummies

Using Arrays 493
A variation of the WHILE loop is the DO-WHILE loop, which looks like this:
do {
Command;
} while (condition);
The main difference between the two loops is that the WHILE loop may run
zero or more times, but the DO-WHILE loop will always run at least once.
Somewhere inside a WHILE and DO-WHILE loop, you must have a command
that can change the condition from True to False; otherwise, the loop will
never end, and your program will appear to hang or freeze.
Book V
Chapter 3
JavaScript
Creating Functions
In JavaScript, every subprogram is a function that can return a value. (A
function that returns a null value simply acts like a procedure in other programming
languages.) The format of a typical function looks like this:
function functionname (Parameter list)
{
Commands;
return value;
}
The two parts of a JavaScript function are
✦ Parameter list: Defines any data and their data types that the function
needs to work. If the function doesn’t need to accept any values, the
parameter list can be empty.
✦ Return: Defines a value to return.
If a function doesn’t return a value or accept any parameters, it might look
like this:
function myfunction ()
{
Command;
}
Using Arrays
JavaScript offers two ways to create an array. First, you can define an array
and the elements inside that array by using square brackets like this:
var myarray = [data1, data2, data3];