The Arguments object is defined only within a function body, and
within every function body, the local variable
arguments refers to the Arguments object for
that function. The Arguments object is an array whose elements are the
values that were passed as arguments to the function. Element 0 is the
first argument, element 1 is the second argument, and so on. All
values passed as arguments become array elements of the Arguments
object, whether or not those arguments are given names in the function
A reference to the function that is currently executing. Useful for recursion in unnamed functions. JS 1.2; JScript 5.5; ECMA v1; only defined within a function body.
The number of arguments passed to the function. JS 1.1; JScript 2; ECMA v1; only defined within a function body.