The TrueJ programming language is a Java-like language that is being developed to serve as an example of Variable-Value programming. The code repository is at https://github.com/Variable-Value/TrueJ

One way to learn the TrueJ language is by reading the results from the testable specifications. These are formatted for readability, except that to get to the readable part you have to decide which mangled file name you need to click on. Look at the end of the lines to see the name of the features and click anywhere on the line to open the readable test results for that feature. The names that begin with a single alphabetic character, like .../a_valueNames.feature, show the main features of TrueJ in a suggested reading order.

The Cucumber code is also available for the testable specifications.

TrueJ code commands are also declarative statements, and the compiler proves that they support any additional claims or specifications in the code. Another way to think of it is that that the compiler proves that these factual claims about the program's data or specifications of the state are true when the code execution reaches them. The prover that is used in the compiler also has testable specifications. However, readability is a work in progress for these test results. The Cucumber code for the prover's testable specifications are also available.