My bookmarks from Diigo 03/26/2009

• Class: Hash

  tags: ruby, hash

• Softies on Rails: Ruby 201: Weird Hash Syntax

  tags: ruby, rails, hash, syntax

  • vehicles.select { |k,v| v > 20 }
    => { :planes=>21, :cars=>36}
  • Behold, our original code now does something beautiful:
  • vehicles = { :cars => 36, :boats => 8, :trains => 12, :planes => 21 }
    
    vehicles.select { |k,v| v > 20 }
    => [[ :planes, 21], [ :cars, 36]]
  • a = [[:planes, 21], [:cars, 36]].flatten
    => [ :planes, 21, :cars, 36]

  • Make It Part of Ruby

    
    
    
    

    If you do this a lot, you could wrap this up in a method… but you can also choose to modify the Hash class directly:

  • class Hash
    alias :old_select :select
    
    def select(&block)
    a = old_select(&block)
    Hash[*a.flatten]
    end
    end

Posted from Diigo. The rest of my favorite links are here.