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function foo(x1, x2) {
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// the arguments array:
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var argv = foo.arguments;
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// number of arguments (same as argv.length):
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var n = foo.arguments.length;
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// y1 is same as this.x1 or argv[0]:
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var y1 = foo.arguments[0];
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// the last argument (same as argv[n-1]):
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var yn = foo.arguments[n-1];
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// use inside function to determine caller:
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var wherefrom = foo.caller;
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}
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This allows one to process functions with a variable number of arguments
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The arguments array is a property of all user-defined functions and Function objects.
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