Stopify – An experimental, web-based code editor

The VB6 IDE, in the 90&#x27;s, had a great feature where you could arbitrarily drag the execution point around. It was incredibly useful for basically zero iteration time for development. Add a breakpoint, step over your code, and if something went wrong, drag the execution point back a few lines, fix it, and try again.<p>This seems like a holy grail for IDEs. Why was this feature lost in time, or have I been using the wrong IDEs?

It&#x27;s worth noting that Stopify itself isn&#x27;t an editor or IDE as the title suggests.<p>Stopify is a JavaScript -&gt; JavaScript compiler, implemented as a Babel transform, that enables pausing and restarting control operators for JavaScript programs.<p>A lot of the comments note the rich history of systems for debugging and execution control. Stopify&#x27;s goal is to enable those kinds of systems, efficiently, <i>while constrained by the browser&#x27;s execution model</i>.

Very cool project, though I fear that the awesomeness of the project may become lost due to people confusing the title with &quot;Spotify&quot; or &quot;Shopify&quot;.

I read Spotify.<p>I am not sure if this is a good thing at all, sorry, just don&#x27;t think it&#x27;s a good thing.

It makes me a little happy inside that Scala is the language it demos first.

The C++ example overflows int on most platforms. You may want to change your example!

So it just splits the code up into setImmediate&#x2F;setTimeout calls?

This is very interesting. How much slow is the execution compared to regular javascript?

I believe this is called &quot;time travel debugging&quot; in the Microsoft world. I use it all the time with C#&#x2F;TS in VS.<p>Since the name sucks, maybe a renaming based off the concept of time travel is a better choice?

Too close to Spotify

I am confused. It says this is a &quot;JavaScript-to-JavaScript&quot; compiler, but none of the selectable languages are Javascript?

It was hack day at shopify today, was thinking this was a project from that