*all_users.select(&:is_active).map(&:name).sort* *isn't standard Ruby; i... | Hacker News

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Freaky on Oct 18, 2008 | parent | context | favorite | on: Elements of Ruby Style

all_users.select(&:is_active).map(&:name).sort

isn't standard Ruby; it will (currently) only work in Rails.

It's standard in 1.9, and making it work in 1.8 is all of 3 lines:

    class Symbol
      def to_proc() proc {|obj, *args| obj.__send__(self, *args) } end
    end

Or if you've got facets:

    require 'facets/symbol/to_proc'

mhartl on Oct 21, 2008 [–]

It's standard in 1.9

That's why I said "(currently)". From the official Ruby homepage: The current stable version is 1.8.7.

making it work in 1.8 is all of 3 lines

I agree, but this still makes it not standard Ruby. The article should have mentioned this.

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