On 2016/08/02 18:57, sawadatsuyoshi / gmail.com wrote:
> Issue #12648 has been reported by Tsuyoshi Sawada.

> Feature #12648: `Enumerable#sort_by` with descending option
> https://bugs.ruby-lang.org/issues/12648

I have felt the need for such an additional argument (or something 
similar) quite recently. But the examples with numbers aren't very 
convincing, just changing

array.sort_by { |e| e }
to
array.sort_by { |e| -e }
will do the job. But there are many cases where that's not possible, 
starting with strings.

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