Function Object

Creates a new function.

Syntax 1

function functionName([argname1 [, ...[, argnameN]]])

Syntax 2

functionName = new Function( [argname1, [... argnameN,]] body );


Required. The name of the newly created function
Optional. A list of arguments the function accepts.
Optional. A string that contains the block of JScript code to be executed when the function is called.


The function is a basic data type in JScript. Syntax 1 creates a function value that JScript converts into a Function object when necessary. JScript converts Function objects created by Syntax 2 into function values at the time the function is called.

Syntax 1 is the standard way to create new functions in JScript. Syntax 2 is an alternative form used to create function objects explicitly.

For example, to create a function that adds the two arguments passed to it, you can do it in either of two ways:

Example 1

function add(x, y)
   return(x + y);            //Perform addition and return results.

Example 2

var add = new Function("x", "y", "return(x+y)");

In either case, you call the function with a line of code similar to the following:

add(2, 3);
Note   When calling a function, ensure that you always include the parentheses and any required arguments. Calling a function without parentheses causes the text of the function to be returned instead of the results of the function.


arguments Property | caller Property | constructor Property | prototype Property


toString Method | valueOf Method


Version 2

See Also

function Statement | new Operator | var Statement