I seriously hope nobody takes the advice in this article seriously.

Here are the conclusions you should take away from the article: Don't use reduce to reimplement map. Don't use reduce to reimplement flatmap. Don't use reduce to reimplement groupBy. Don't use reduce to reimplement filter. The minMaxReducer is the only legitimate use of reduce in the entire article.

The above functions require less boilerplate code. With reduce you will have to write additional bookkeeping code for the accumulator and without mutable data structures [!] it would be incredibly inefficient.

[!] We are far away from functional programming at this point.