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JavaScript Interactive Web Pages with JavaScript Traversing and Manipulating the DOM with JavaScript Perform: Changing Classes

When he said you should feel more accomplished...

...and I feel like all my knowledge was just tossed around and violated in the most vicious ways.

If the problem was with the challenges (?), you could email support and ask them to include a note on the individual challenges that observes that they might not accept let/const, or the arrow notation.

I feel your pain bro.