[jaredharley]

Based on the linked github page[1], it looks like that comment was an extrapolation from a guideline in Airbnb's Ruby Style Guide, where Airbnb prefers the use of `reduce` instead of `inject`:

- Prefer `reduce` over `inject`.

I haven't seen any other evidence to show reduce is more performance friendly.

[1]: https://github.com/airbnb/ruby#collections

[bshimmin]

How could it be..? https://github.com/ruby/ruby/blob/ruby_2_3/enum.c#L3509-L351...

I prefer `reduce` too, because it feels conceptually easier to understand (similarly `foldl`, though Ruby doesn't have that).