Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/core-ext/hash.rb

Instance Method Summary collapse

Instance Method Details

#only(*keys) ⇒ Object

Returns a new hash containing only the keys specified that exist in the current hash.

{:a => '1', :b => '2', :c => '3'}.only(:a, :c)
# => {:a => '1', :c => '3'}

Keys that do not exist in the original hash are ignored.



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# File 'lib/core-ext/hash.rb', line 9

def only(*keys)
  inject( {} ) do |new_hash, (key, value)|
    new_hash[key] = value if keys.include?(key)
    new_hash
  end
end

#symbolize_keys ⇒ Object 



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# File 'lib/core-ext/hash.rb', line 16

def symbolize_keys
  inject({}) do |options, (key, value)|
    options[(key.to_sym rescue key) || key] = value
    options
  end
end