Confusion regarding the constructor property of the string

Question

I have been following javascript tutorial from www.w3school.com and while reading one of the examples i have got one question in my mind, the code is as follows:

<html> <body> <script type="text/javascript"> var txt =new String ("Hello World!"); document.write(txt.constructor); </script> </body> </html>

Now, iam getting in response of this code is :

function String() { [native code] }

However, according to me the constructor must have a parameter in it somewhat like this:

function string(value){}

Can anybody please tell me why it is returning the constructor with no parameter.

In js arguments are implicit developer.mozilla.org/en/JavaScript/Reference/… — clyfe
– clyfe, Commented Jan 3, 2012 at 9:57

ijse · Accepted Answer · 2012-01-03 10:02:13Z

Even no parameter defined in a JavaScript function, we still can get the parameters with arguments:

function test() { console.log(arguments); } test(1,3,6); // Output "[1,3,6]" in console.

user1000131 · Accepted Answer · 2012-01-03 10:34:04Z

The other comments are true, but they don't address your question. The reason you're not seeing any parameters, and why it's saying "[native code]" instead of the actual content of the function, is that window.String is a native function - it is not a reference to a javascript function, but instead a symbol that instructs the browser what to do when it's running your javascript. Think of it as more analogous to a plus sign than a function.

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