One of the most powerful new features of JavaScript 1.2 is a set of objects and methods to provide regular expression functionality. Perl programmers have relied on regular expressions for
In Java, you can propagate checked exceptions up a class hierarchy in two ways. First, you can declare the exception in the “throws” clause of the enclosing method. Second, you
It is legal to call a function that may throw an exception inside a destructor. However, it is important to handle any exception that might be thrown from such a
Using public inheritance with two classes that do not fully comply with the is-a relation (although they are related to one another) is a common design mistake. For example, deriving
Using a longjmp() in C++ is dangerous because it jumps out of a function, without unwinding the stack first. Consequently, destructors of local objects are not invoked. As a rule,
Use this function to determine whether a dynamic array has been dimensioned. I use dynamic arrays to store small, foreign key tables locally for fast lookups. Not wanting to load
You might need to determine whether a certain key is in a collection. The Collection object doesn’t provide a method to retrieve a key after you add an object to
The ListView Windows control has some additional features that haven’t been exposed in the OCX provided with VB. One feature can shrink or enlarge columns automatically to ensure that data
Forgetting the names of global variables is easy to do. You can solve this problem by letting VB remember the variables for you by making the variables into fields of