1097Chapter 41 .Functions and Custom Objects At the (Post office web site)
1097Chapter 41 .Functions and Custom Objects At the opposite end of the spectrum, JavaScript also doesn t balk if you send more parameters from the calling statement than the number of parameter variables specified in the function definition. In fact, the language includes a mechanism the arguments property that you can add to your function to gather any extraneous parameters that should read your function. Properties arguments Value: Array of arguments Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . . When a function receives parameter values from the statement that invokes the function, those parameter values are silently assigned to the arguments property of the function object. This property is an array of the values, with each parameter value assigned to a zero-based index entry in the array whether or not parame ters are defined for it. You can find out how many parameters are sent by extracting functionName.arguments.length. For example, if four parameters are passed, functionName.arguments.length returns 4. Then, you can use array notation (functionName.arguments[i]) to extract the values of any parameter(s) you want. Theoretically, you never have to define parameter variables for your functions by extracting the desired arguments array entry instead. Well-chosen parameter variable names, however, are much more readable, so I recommend them over the arguments property in most cases. But you may run into situations in which a sin gle function definition needs to handle multiple calls to the function when each call may have a different number of parameters. The function knows how to handle any arguments over and above the ones given names as parameter variables. See Listings 41-1 and 41-2 for a demonstration of both the argumentsand caller properties. arity Value: Integer Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . See the discussion of the length property later in this chapter. functionObject.arity
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