> There are no downloads, there is no setup... For a REPL/solving an algorithms problem? Sure. And the first time they want to use some code from StackOverflow

> There are no downloads, there is no setup... For a REPL/solving an algorithms problem? Sure. And the first time they want to use some code from StackOverflow that uses a library, god forbid, it's off to the races. Require? Script tag? Webpack? Transpile? Minify? All of those things are important tools, but their use (and presumption of their use, a la "just import 'map' from underscore.js; you know the drill") is so widespread as to present a major stumbling block for first-time programming explorers.