java ean 13 check digit A Script Function Primer in Java

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A Script Function Primer
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A Script function is defined outside of the class definition and can be called anywhere inside your script This means you can create a function to perform a specific task and call it from anyplace inside your script file, any number of times
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Think of a Script function as a tech support call center, and you are a script file You can call the tech support call center to perform a task that you do not have the capability to perform on your own The call center takes the call, does some work, and returns you an answer You then hang up the call and go on with your own duties Script functions perform the same way Script functions are defined using the function keyword, and the syntax for creating them is a follows:
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function <function name> ( <function parameters> ) <: return type> { <function code> }
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The first, and most important, item is the function keyword This keyword tells the compiler that everything between the curly braces that is, between { and } is a function and should be compiled as such The compiler will put the function code together in a way that allows other parts of the script to call it and use the returned values
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function {}
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Next, <function name> is the name you assign to the function to separate it from other functions in your script When naming your function, try to use action words that describe the purpose of the function, such as paintCar, addValues, or getTextFromBox Notice that the first letter is always lowercase The first letter of each remaining word in the function name is capitalized This style of naming is known as camel casing
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The act of camel casing your function names is not enforced by the compiler Therefore, you could name a function addValues or AddValues and the JavaFX compiler would not stop you However, it is a convention that is followed by most Java developers This would be a good habit to begin, and it will make your code look more professional
In some situations, the name of the function is not needed One such situation is when you are creating the function specifically to be used as the value to one specific attribute of a node You will explore this situation later in the book, so for now assume that all functions have names
function addValues() {}
Following the function name is a list of any parameters that can be passed into the function For example, a function named addValues would be useless without values to add together You can create input parameters for your function that allow you to send values to the function The function can then use these values in its code body The example that follows creates two input parameters for the addValues function:
JavaFX: A Beginner s Guide
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All input parameters should be placed within the parentheses that follow the function name and separated by a comma function addValues(valueA, valueB) {}
A return value type can be placed after the parentheses that follow the function name The return type tells the compiler that when this function is finished running it is going to return this type of value back to the code that called it For example, a function that adds two values together and produces a result should return that result as a double:
function addValues(valueA, valueB) : Double {}
NOTE
There are times when the return type of your function would have no corresponding type, or when your function may not need to return anything at all In these instances it is a good practice to declare the function type as : void The function will still work if you leave the type designator off completely it is just good practice to type it as void
Finally, the code or body of the function should be placed between the curly braces This is the meat of the function, and it does all the work of the function If your function returns a specific value, the return keyword is used to push that value back to the calling code:
function addValues(valueA, valueB) : Double { return (valueA + valueB); }
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