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Rifqi Fahmi23,164 Points
Is treehouse challenge not yet implement ES2015 ? (especially the interpolation)
the arrow function seems fine but the interpolation using backtick (`) still get an error.
Node.js implements some, but not all ES2015 features.
See the article ECMAScript 2015 (ES6) and beyond for more information.
Presumably the challenge system (and workspaces, etc) use a particular version of Node, and it may not be the newest version.