Noob question: is there a way to findout a class's methods without reading the source?

[Jonas Smith]

I'm new to javascript.

Is there a way to find out what methods a class has without having to
read the source of the class? especially the built-in classes?

 

[RobG]

I'm new to javascript.

Is there a way to find out what methods a class has without having to
read the source of the class?

Javascript doesn't have classes, however it does have objects that can
be used to imitate the behaviour of classes in other languages.

You can iterate over the enumerable properties of an object using
for..in and see which ones are functions, however you wont discover
the non-enumerable properties. Further, some browsers make it
difficult to tell if host object properties are functions or not, so
it is not a particularly good strategy.

especially the built-in classes?

The properties of built-in objects are not enumerable, nor is the
source code for them easily available. You're much better off to read
the ECMAScript Language specification:

<URL: http://www.mozilla.org/js/language/E262-3.pdf >

 

[Martin]

I'm new to javascript.

Is there a way to find out what methods a class has without having to
read the source of the class? especially the built-in classes?

If you open a javascript file using Netbeans 6.1 (latest version) and
look at the Navigator panel you'll see the script's various
'properties and methods'.

http://www.netbeans.org/features/web/web-app.html

Martin.

 

[Jonas Smith]

Javascript doesn't have classes, however it does have objects that can
be used to imitate the behaviour of classes in other languages.

You can iterate over the enumerable properties of an object using
for..in and see which ones are functions, however you wont discover
the non-enumerable properties. Further, some browsers make it
difficult to tell if host object properties are functions or not, so
it is not a particularly good strategy.



The properties of built-in objects are not enumerable, nor is the
source code for them easily available. You're much better off to read
the ECMAScript Language specification:

<URL: http://www.mozilla.org/js/language/E262-3.pdf >

Thanks.