arguments Object (JavaScript)

An object representing the arguments to the currently executing function, and the functions that called it.



Optional. The name of the currently executing Function object.


Required. The zero-based index to argument values passed to the Function object.

You cannot explicitly create an arguments object. The arguments object only becomes available when a function begins execution. The arguments object of the function is not an array, but the individual arguments are accessed the same way array elements are accessed. The index n is actually a reference to one of the 0n properties of the arguments object.

The following example illustrates the use of the arguments object.

function ArgTest(a, b)
   var s = "";

   s += "Expected Arguments: " + ArgTest.length;
   s += "<br />";
   s += "Passed Arguments: " + arguments.length;
   s += "<br />";

   s += "The individual arguments are: "
   for (n = 0; n < arguments.length; n++)
      s += ArgTest.arguments[n];
      s += " ";


ArgTest(1, 2, "hello", new Date())

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.

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