Error Handling and Debugging

JavaScript has traditionally been known as one of the most difficult programming languages to debug because of its dynamic nature and years without proper development tools. Armed with the proper language support and development tools, web developers are empowered to implement proper error-handling processes and figure out the cause of problems. Before JavaScript debuggers were readily available, developers had to use creative methods to debug their code. This led to the placement of code specifically designed to output debugging information in one or more ways. Most browsers do not report JavaScript errors to users by default, so developers need to enable error reporting when developing and debugging. The most common debugging technique was to insert alerts throughout the code in question, which was both tedious, because it required cleanup after the code was debugged, and annoying if an alert was mistakenly left in code that was used in a production environment.