About Expression Tutor

The backstory


Expression Tutor was developed at the Lugano Computing Education research lab (LuCE) at the Software Institute of the Università della Svizzera italiana (USI) in Lugano, Switzerland.

Contributors (in alphabetical order):


A large fraction—often the majority—of source code consists of expressions. When teaching programming in various languages, we noticed that students often did not fully understand the expressions they created. To help us teach expressions, and to make the relevant concepts more visible, we developed the “expression as tree” notional machine and its web-based realization in the form of Expression Tutor.


Expression Tutor is a React web application built on top of Next.js. Its backend consists of different services implemented using a multitude of technologies.