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Functions in JavaScript 20 can be defined so that they can accept an unlimited number of parameters You would want to do this when your function needs to accept a large number of identical parameters but you do not want to create lots of named optional parameters The rest parameter must always appear at the end of any unnamed parameters that are defined, using three periods () Named parameters, those defined using the named keyword, can still be listed after the rest parameter Of course, there can only ever be one rest parameter for a single function The following code defines a function that can accept an unlimited number of parameters The first four arguments passed will be assigned to the first four parameters defined: name, address, phoneNum, and spouseName Any arguments passed beyond those four will be assigned to an array called childName We can use a for-in loop to get the list of names out of that variable (We will look at arrays in depth in 4)
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function printform (name : String, address : String, phoneNum : String, spouseName : String, childName : Array) { // An unlimited number of children can be provided with (document) { write ("Name: " + name + "<br>"); write ("Spouse: " + spouseName + "<br>"); write ("Address: " + address + "<br>"); write ("Phone: " + phoneNum + "<br>"); for (child in childName) { write ("Child " + childName[child] + "<br>"); } } return; }
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In the next chapter, we will focus on some of JavaScript s most powerful features its built-in objects and functions
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Master objects in JavaScript Understand JavaScript s built-in classes and data types Create a String object in JavaScript Perform mathematical functions Apply JavaScript s date-handling functions Convert strings into numbers Prepare text before sending to web server Decide when to use regular expressions Use JavaScript 20 s powerful new data types Decide when to use JavaScript 20 s special data types
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JavaScript has always contained a number of built-in classes that programmers could employ when developing programs These classes self-contained data and code provide useful functionality for handling dates, mathematical functions, and arrays For instance, if you wanted to retrieve the current date and time in JavaScript, you would create an instance of the Date class, as so:
var today = new Date();
The today variable in this code is actually an object Not only does the today object contain a value (today s date in fact), but it also contains a number of built-in functions for retrieving and setting individual parts of the date and converting it into a number of different formats (a string, for instance) The Date class, and all of its functionality, is explored in the section Apply JavaScript s Date-Handling Functions, later in the chapter JavaScript 15 contains nine such classes, but only three are used in common practice (Array, Date, and Math) JavaScript 20 has expanded the list to more than 18 classes, and almost all of them are useful In this chapter, we will examine most of these classes and learn to apply them in our JavaScript programs
Learn about Objects in JavaScript
We are approaching the 50th anniversary of the development of Fortran, the first high-level programming language, which was developed in 1956 Since that time, computer scientists have developed several programming methodologies Table 3-1 lists the most common methods of designing programs It s important to remember that no methodology is perfect for every situation In JavaScript programming, you are likely to use any of the four methodologies listed in Table 3-1, depending on the task at hand
CHAPTER 3: Use Built-in JavaScript Classes
Methodology Unstructured Procedural Modular Object-oriented TABLE 3-1
Description Sequence of statements acting on global data Main program that calls functions to perform certain tasks Main program that uses modules to group related functionality Main program that uses objects to group related data and functionality
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