Class Hash
In: lib/core-ext/hash.rb
Parent: Object

Methods

only  

Public Instance methods

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.

[Source]

# 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

[Validate]