While the WMLScript does not support a creation of the new objects via an object-oriented programming, it do provides six "pre-built" libraries. These library functions aid in the handling of many common tasks. These libraries (with the brief description of each) includes:

• Lang - This library contains the set of a functions that are closely related to a WMLScript language core. Included in this library are the functions for a data type manipulation, the absolute value calculations, and the random number generation.
  
  

• Float - Float library is an optional and is the only supported on those clients who have the floating-point capabilities. A typical functions provided by this library includes the sqrt(), the round(), and the pow().
  
  

• String - A String library contains the set of functions for performing the string operations. Some of the functions which are included in this library are the length(), the charAt(), the find(), the replace(), and finally the trim() function.
  
  

• URL - This library do contains the set of a functions for handling both the absolute URLs and also the relative URLs. A typical functions include the getPath(), the getReferer(), and the getHost() function.
  
  

• WMLBrowser - This library do contains the functions by which the WMLScript can access an associated WML context. These functions should not have any side effects and should return invalid in cases when the system does not support the WMLBrowser and when the interpreter is not been invoked by an WML Browser. The commonly used functions in this library are next(), getCurrentCard(), go(), prev() and the refresh() function.
  
  

• Dialogs - This library do contains the set of typical user interface functions including the prompt(), the confirm(), and the alert() function.