- Arguments
- Function Parameters
- Public Attribute Keyword
- Private Attribute Keyword
- Defining Constants
This chapter is from the book
This chapter is from the book
This chapter is from the book
Function Parameters
Function parameters are essentially the variable names of values that are passed into a function. Function parameters are fairly straightforward and have not changed in ActionScript until now.
AS2: Function Parameters
Parameters are a fundamental part of the function definition. ActionScript 2 allows parameter typing, meaning that parameters can be specified as any native type, such as String, Boolean, Number, and so on—or can even be typed as a custom object. Typing provides control and reliability of values allowed into a function and prevents bugs by providing detailed information about your code to the Flash compiler.
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AS3: Function Parameters
Function parameters have always been a part of ActionScript. ActionScript 3 allows parameters to have default values, which essentially make them optional parameters. For example, if a parameter has a default value and a function call omits the parameter, the default value is used.
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The optional parameter, named round, has a default value of false. The round parameter will remain false unless an alternate parameter value is passed in a function call. Therefore, the addNumbers sample function will not round the total it returns.