Internet Explorer 5.0 Review, Part IV: Exception Handling - | WebReference

Internet Explorer 5.0 Review, Part IV: Exception Handling -

Internet Explorer 5.0 Review, Part IV: Exception Handling

In this column we continue our review of Internet Explorer 5.0. We focus here on one of IE 5.0's major additions to JavaScript: exception handling. Exception handling is a key feature of modern programming languages such as C++, Java, and VBScript. By adding exception handling to its syntax, Microsoft promoted JavaScript to C++'s and Java's standard of languages. Exception handling is based on a syntax that allows the programmer to differentiate between normal-processing code and error-processing code. In industrial-strength code, almost half of the lines deal with errors and exceptions. Separating exception handling code from the other lines makes the code much easier to read, maintain, and modify. Up till now, some programmers preferred VBScript over JavaScript because JavaScript did not support exception handling. Since JavaScript is superior to VBScript in many other ways, we foresee a movement of VBScript programmers to the JavaScript camp.

In this column we'll teach you the basics of exception handling and how to use JavaScript's syntax to take advantage of it. We show you several examples that demonstrate the idea and its implementation. We also emphasize the difference between exception handling in JavaScript and in other languages. In particular we'll show you:

Produced by Yehuda Shiran and Tomer Shiran

Created: April 26, 1999
Revised: April 26, 1999