The original code for Processing.js used regular expressions to convert Java into JavaScript when it was encountered. It did this by scanning for hints of Java code within the entire sketch and then replaced the Java code with its JavaScript equivalent. Due to the difference in how Java and JavaScript accessed object properties from methods inside an object, the with statement was used as a simple solution to avoid having to prepend all function calls with "this." or "Processing.". However, the use of the with statement also meant that the JavaScript generated would fall off Trace /*cite trace paper here... do we need to talk about trace in the back ground section???*/ making the code run slower than it needed to in some browsers. In later versions of Processing.js this method of scanning the entire sketch was replaced by the creation of an abstract syntax tree that broke up the up the sketch into smaller pieces. Each piece was then interpreted separately. This change made the interpretation of the sketch far cleaner.

==Browser Unification==