Module: ActiveSupport::CoreExtensions::Hash::Diff

Included in:
Hash
Defined in:
lib/gems/activesupport-2.2.2/lib/active_support/core_ext/hash/diff.rb

Instance Method Summary collapse

Instance Method Details

#diff(h2) ⇒ Object

Returns a hash that represents the difference between two hashes.

Examples:

{1 => 2}.diff(1 => 2)         # => {}
{1 => 2}.diff(1 => 3)         # => {1 => 2}
{}.diff(1 => 2)               # => {1 => 2}
{1 => 2, 3 => 4}.diff(1 => 2) # => {3 => 4}



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# File 'lib/gems/activesupport-2.2.2/lib/active_support/core_ext/hash/diff.rb', line 13

def diff(h2)
  self.dup.delete_if { |k, v| h2[k] == v }.merge(h2.dup.delete_if { |k, v| self.has_key?(k) })
end