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Function object in JavaScript

The Function object in JavaScript is a function that creates a new one.

The method of use is as follows:

Grammar 1

FunctionfunctionName ([argname1 [,... [, argnameN]) {body}

Grammar 2

Reference:

FunctionName=newFunction ([argname1, [... argnameN,]] body)

Where functionName is a required option. * create the name of the function

Argname1...argnameN is optional. The list of parameters received by the function.

Body is optional. A string containing the block of JScript code that was executed when the function was called.

The basic data type in the function JScript. Syntax 1 creates function values that are converted by JScript to Function objects if necessary. JScript converts a function created with Syntax 2 to a Fnction object when calling a function.

Syntax 1 is the basic method for creating functions in JScript. Syntax 2 is another method for explicitly creating function objects.

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

Example 1

Functionadd (x _ ray) {return (x _ ray); / / performs the addition and returns the result. }

Example 2

Varadd=newFunction ("x", "y", "return (x)")

In both cases, you can call the function with the following line of code:

Add (2pr 3)

When calling a function, be sure to include parentheses and required arguments. Calling a function without parentheses causes the text of the function to be returned instead of the result of the function execution.

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