JavaFX Functions in Java

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A JavaFX function is a group of statements and expressions that apply some logic that may be based on supplied parameters or other stateA function may return a value and/or modify some state within the applicationThe logic in the body of the function is invoked by quoting the function s name together with the values of any required arguments Placing code in a function makes it reusable without having to replicate it in multiple places, which would cause problems should that code ever need to be changed JavaFX has two types of function: bound and unboundThe motivation for two different types of function is that they behave differently in a binding context that is, when some application state is bound to the value returned by the function In this chapter, we restrict ourselves to discussing unbound functions and leave bound functions until we cover binding in 9
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Declaring Functions
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A function can be declared within a JavaFX class or anywhere that a statement can appear within a JavaFX source fileThe syntax is the same in both cases Because we don t discuss the topic of writing JavaFX classes until 11, the examples in this chapter all show functions declared at the level of the script file,5 which are referred as script functions (by contrast to functions declared in the body of a class, which are instance functions) The syntax of a function declaration is as follows:
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[modifiers] function name([arguments]) [:return type] { body }
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Here s a simple example that contains all the possible components of a function declaration:
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public function square(x:Number):Number { return x * x }
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In fact, functions that are coded directly inside the source file are within the scope of a JavaFX class, even though they may not appear to be For the most part, you don t need to know that this is the case If you want to know more, you ll find the details in 11
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The modifiers that may be applied to a function determine the visibility of the function to other code See the section Visibility of Functions, later in this chapter, for the details The function name is mandatory and must follow the rules for JavaFX identifiers listed in Variable Declarations in 5The name should be meaningful and descriptive of what the function is supposed to do The arguments, if present, must be separated by commas For each argument, both the type and a name must be givenThe name is used in the body of the function to refer to the argument The return type specifies the type of the value that the function returns If this is not specified, it will be inferred at compile time from the type of the expression in the function body that generates the return valueA function that does not need to return a value should be declared with a return type of Void Note
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You may have noticed that a JavaFX function does not have a throws clause, but this does not mean that it will not throw an exception Although JavaFX code can throw and catch exceptions, you are not forced to handle checked exceptions as you would in Java, and therefore functions do not declare the exceptions that they might throw JavaFX exception handling is covered in 8, Controlling Program Flow
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The following simple function prints the current date and time to the standard output stream It is an example of a function that requires no arguments and returns no value:
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import javautilDate; function printDateAndTime():Void { println(new Date()); }
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Notice that the return type, in this case Void, is separated from the argument list by a colon The following function, called average, returns the average of two values passed as arguments:
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function average(value1:Number, value2:Number):Number { return (value1 + value2) / 2; }
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The function arguments are called value1 and value2; both are of type NumberArgument names are subject to the same rules as all JavaFX identifiers, and each argument must have a unique nameWithin the body of the function, wherever the argument names are used, the corresponding value passed by the caller of the function will be substituted The return value in this example is declared to be of type NumberThe value that will be returned is given by the expression attached to the return statement, which must be
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