Advanced solutions with no explanation

It’s great to see super efficient wow code in an advanced solution.

However, it’s frustrating to see no explanation.
People are lost by the => notation which I have recently being reminded is a lambda expression.

The advanced solutions typically leverage ES2015 features, which are going to be a subject in the fCC curriculum soon. It wouldn’t make sense to explain arrow functions in the solution any more than it would to explain curly braces or the function keyword. In the meantime, you could pick up some ES2015 from YouTube, like this tutorial.

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Thanks for that but again, some explanation of the code would be nice by the person who came up with it. We are here to learn remember.