A ruby puzzle

Name this function:

  inject({}) { |h, o| h[yield(o)] = o; h }.values

Hints:

  1. It’s a variant of a common stdlib function.
  2. The name has 7 characters, one of which is an underscore.

A survey of my rubyist colleagues suggests this is a hard question. Much harder than writing the function given the name, which took about 10 seconds.

— William Morgan, June 13, 2008.
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