Deep Learning of Function object syntax in JavaScript

This article describes the syntax of the Function object in JavaScript through examples. The Function object in JavaScript is to create a new Function.

Function objects in JavaScript

In JavaScript, the Function object is used to create a new Function.

The usage is as follows:

Syntax 1

 
 

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

Syntax 2

Reference:

 
 

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

FunctionName is required. Name of the newly created Function
Argname1.. argnameN is optional. List of parameters received by the function.
Body is optional. A string that contains the JScript code block executed when the function is called.

The basic data type in the function JScript. Syntax 1 creates a Function value that is converted from JScript to a Function object when necessary. When calling a function, JScript converts the function created in syntax 2 to a Fnction object.

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

For example, to create a function that adds the two parameters passed to it, you can use either of the following methods:

Example 1

 
 

  
  
Functionadd (x, y)
  
  
{
  
  
Return (x + y); // execute addition and return the result.
  
  
}
 
 

Example 2

 
 

  
  
varadd=newFunction("x","y","return(x+y)");  
  
  
 
 
 

In either case, you can use the following code line to call the function:

 
 

  
  
add(2,3);  
  
  
 
 
 

When calling a function, make sure that the brackets and necessary parameters are included. When calling a function, no parentheses are used to return the text of the function rather than the result of function execution.