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 0 n 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())  

// Output:  
// Expected Arguments: 2  
// Passed Arguments: 4  
// The individual arguments are: 1 2 hello Tues Jan 8 08:27:09 PST 20xx  


Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

See Also

0...n Properties (arguments)
callee Property (arguments)
length Property (arguments)