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Contents
class Hash
# Modifies the receiving Hash so that the value previously referred to by
# _oldkey_ is referenced by _newkey_; _oldkey_ is removed from the Hash.
# If _oldkey_ does not exist as a key in the Hash, no change is effected.
#
# Returns a reference to the Hash.
#
# foo = { :a=>1, :b=>2 }
# foo.swapkey!('a',:a) #=> { 'a'=>1, :b=>2 }
# foo.swapkey!('b',:b) #=> { 'a'=>1, 'b'=>2 }
# foo.swapkey!('foo','bar') #=> { 'a'=>1, 'b'=>2 }
#
#--
# Credit goes to Gavin Sinclair.
#++
def swapkey!( newkey, oldkey )
self[newkey] = self.delete(oldkey) if self.has_key?(oldkey)
self
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_swapkeys!
foo = { :a=>1, :b=>2 }
assert_equal( { 'a'=>1, :b=>2 }, foo.swapkey!('a', :a) )
assert_equal( { 'a'=>1, 'b'=>2 }, foo.swapkey!('b', :b) )
assert_equal( { 'a'=>1, 'b'=>2 }, foo.swapkey!('foo','bar') )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems