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REPL (Read-Eval-Print Loop) is an interactive way to program. You feed bits of the program line by line, in contrast to compiling a bunch of files. This is kinda like giving instructions live vs writing down a list beforehand.

When solving some problems, it's easier and quicker to use a REPL to get something that more or less works, and then to copy the working bits over to a proper source file to reuse. Before this React Sketch, Sketch.app was just the equivalent of the REPL, where you'd only store the result of your work, and not the process. Now you have a way to, as soon as you're happy with a design you drew by hand, write the code to generate it in order to reuse it in the future.




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