I'm taking the opportunity to mention my project that implements a language that is inspired by, and is mostly compatible with APL. It has some major difference

I'm taking the opportunity to mention my project that implements a language that is inspired by, and is mostly compatible with APL. It has some major differences, such as being lazy evaluated and providing support for first-class functions. It also supports defining syntax extensions which is used by the standard library to provide imperative syntax, which means you can mix traditional APL together with your familiar if/else statements, etc. At this point there isn't much documentation, and the implementation isn't complete, so I'm not actually suggesting that people run out to try it unless they are really interested in APL. I just took this opportunity since APL is mentioned so rarely here. https://github.com/lokedhs/array https://github.com/lokedhs/array There is an example of a graphical mandelbrot implementation in the demo directory, that may be interesting.