programming-books/free-programming-playgrounds.md at d1b7ad75defbe91c6909f3db5e7eb6f93368e372

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Update free-programming-playgrounds.md (#3526 )

* Update free-programming-playgrounds.md

Added codesandbox.io under React (and removed the react reference from its listing on JavaScript).
Added a Java section and linked to repl.it
repl.it actually has sandboxes for most of the languages listed here, and maybe some others, but I didn't add them all in. The Swing support for Java is new, and has some bugs. They didn't respond to my report, so I think they are spread a little thin.

* add spaces to satisfy linter

* add space to satisfy linter

Co-authored-by: Eric Hellman <eric@hellman.net>

2020-02-20 13:56:35 -05:00