agreed, the Array.prototype.reduce could be accomplished in a far more readable way using a simple forEach. If the function was doing a `concat` instead of a `p

agreed, the Array.prototype.reduce could be accomplished in a far more readable way using a simple forEach. If the function was doing a `concat` instead of a `push`, it would make a lot more sense to me as a functional example, because then the author would actually be taking advantage of the way the accumulator result from the previous call is passed into the next call.