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Re:JS Visualizer – Visualize Context, Hoisting, Closures, an... by kowdermeister on Tuesday October 09, 2018 @02:33PM (#18178590)
I like http://www.pythontutor.com more, it supports ES6, Java, Python, C, C++, Ruby.

It was a great complementary tool explaining some simple algo to students.

Re:JS Visualizer – Visualize Context, Hoisting, Closures, an... by brian_herman__ on Tuesday October 09, 2018 @05:50PM (#18180113)
Maybe I'll reskin pythontutor with like a javascript snippit to make it look as good as this one :)