Working through Eloquent JavaScript exercises
While node is the de-facto tool for server-side js, macOS comes with jsc preinstalled. A much lighter-weight solution since the exercises in this book deal with plain js.
/System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc is the executable location, so ln -s /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc /usr/local/bin for easy access. Then run with jsc script.js.