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Another reason functions are useful is their reusability They can be used more than once within a script to perform their task Rather than rewriting the entire block of code, you can simply call the function again Consider the simple function y=x+2 If you use it only once, the function doesn t serve much purpose If you need to get several values, however, the function becomes increasingly useful Rather than writing out the formula for each calculation, you can just substitute the x values each time you need to get the y value So, if you need the y value when x is 3, 4, and 5, you can use the function three times to get the y values The function will calculate 5, 6, and 7, respectively Instead of writing the content of the function three times, it only needs to be written once to get three answers Functions can perform complex tasks and can be quite lengthy In the examples in this and later chapters, you ll see just how useful and time-saving they are in JavaScript

Now that you understand what functions are and why you want to use them, you need to learn how to structure them in your scripts A function needs to be declared with its name and its code There are also some optional additions you can use to make functions even more useful You can import one or more variables into the function, which are called parameters You can also return a value to the main script from the function using the return statement You will start by looking at how the function begins

FIGURE 12-11

On the first line of a function, you declare it as a function, name it, and indicate whether it accepts any parameters To declare a function, you use the reserved word function, followed by its name, and then a set of parentheses:

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The JavaScript Debugger dialog box lets you set breakpoints in the code and assess the values of variables

function functionname()

the automatic scripts If your script waits for an event like onClick or onMouseOver before executing, perform this action in the browser window As soon as the script reaches a breakpoint, the JavaScript Debugger dialog box regains focus Check the current values of the variables in the list at the bottom of the dialog box, or add and modify breakpoints as needed Change the value of any variable in the list by clicking the Value column of the variable s entry and typing in the new value To continue running your script, click one of the code-stepping buttons Click the Step Over button to execute the current line and pause again at the next line When you click the Step Over button at a line that calls a new function, the new function executes from start to finish, and the Debugger pauses the code at the next line in the main function If you want to enter the new function and pause at its first line instead, click the Step Into button Use the Step Over button to continue line by line through the new function To return to the main function at any time, executing the rest of the current function, click the Step Out button If you don t want to step line-by-line through the functions, clicking the Run button again causes the script to execute until the next breakpoint To close the JavaScript Debugger dialog box, click the Stop Debugging button (shown here) and then close the preview browser

The reserved word function tells the browser that you are declaring a function and that more information will follow The next piece of information is the function s name After that, the set of parentheses indicates whether the function accepts any parameters For example, to name your function reallycool and indicate that it does not use any parameters, the first line looks like this:

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