Grep a hash : Hash Extensions « Hash « Ruby

1. Ruby
2. Hash
3. Hash Extensions

Grep a hash

class Hash
  def grep(pattern)
    inject([]) do |res, kv|
      res << kv if kv[0] =~ pattern or kv[1] =~ pattern
      res
    end
  end
end

h = { "apple tree" => "plant", "ficus" => "plant",
      "shrew" => "animal", "plesiosaur" => "animal" }


p h.grep(/pl/)
p h.grep(/plant/)        # => [["ficus", "plant"], ["apple tree", "plant"]]
p h.grep(/i.*u/)         # => [["ficus", "plant"], ["plesiosaur", "animal"]]

 

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