arguments function scope variable JS Home  <<  JS Reference  <<  arguments

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Array-like object.

Description

The arguments object is a function scope variable that holds a list of the arguments passed to the function.

• The arguments object is only available within a function and will return an error if used outside the function body.
• The arguments object can be accessed in the same way as an array but no array like-methods are available to it except length.
• The arguments object can be be modified using a zero based index.

Syntax

Parameters

Examples

The code below gives examples of using the arguments statement.

*/
 / Create a function statement that takes an argument,
 / modifies the argument within the function and 
 / returns the square of the modified argument.
 /*

function squareNumber(a) {
  alert(arguments[0] + ' argument before modification';)
  alert(arguments.length + ' number of arguments';)
  
  arguments[0] *= 2;
  
  alert(arguments[0] + ' argument after modification';)
  
  return a * a;
}

alert(squareNumber(5));
alert(squareNumber(10));

Related Tutorials

JavaScript Intermediate Tutorials - Lesson 8 - Functions

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