Atul Varma describes his SlowmoJS as “an attempt to make learning JavaScript and computational thinking easier by making the execution of JS code more transparent.”

You give SlowmoJS a chunk of code and it shows each logical step of the code executing while highlighting the interesting bits and displaying the results.

I pasted in Ed Spencer’s FizzBuzz in a Tweet (slightly modified for brevity) and the resulting display is pretty cool. See for yourself.

The project’s source code, design notes, and implementation notes are available on GitHub.


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