Sha256: 1fc44cf6c132c7154f02c8dce6facf64bf4de10bf44ba16449314a2ffa4325c6
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Versions: 26
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Contents
#--
# Credit goes to Gavin Sinclair.
#++
class Hash
# Modifies the receiving Hash so that the value previously referred to by
# _oldkey_ is also referenced by _newkey_; _oldkey_ is retained in the Hash.
# If _oldkey_ does not exist as a key in the Hash, no change is effected.
#
# Returns a reference to the Hash.
#
# foo = { :name=>'Gavin', 'wife'=>:Lisa }
# foo.alias!('name',:name) => { :name=>'Gavin', 'name'=>'Gavin', 'wife'=>:Lisa }
#
# foo = { :name=>'Gavin', 'wife'=>:Lisa }
# foo.alias!('spouse','wife') => { :name=>'Gavin', 'wife'=>:Lisa, 'spouse'=>:Lisa }
#
# foo = { :name=>'Gavin', 'wife'=>:Lisa }
# foo.alias!('bar','foo') => { :name=>'Gavin', 'wife'=>:Lisa }
#
# Note that if the _oldkey_ is reassigned, the reference will no longer exist,
# and the _newkey_ will remain as it was.
def alias!( newkey, oldkey )
self[newkey] = self[oldkey] if self.has_key?(oldkey)
self
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_alias!
foo = { 'a'=>1, 'b'=>2 }
assert_equal( { 'a'=>1, 'b'=>2, 'c'=>2 }, foo.alias!('c','b') )
foo = { 'a'=>1, 'b'=>2 }
assert_equal( { :a=>1, 'a'=>1, 'b'=>2 }, foo.alias!(:a,'a') )
foo = { :a=>1, :b=>2 }
assert_equal( { :a=>1, :b=>2 }, foo.alias!('bar','foo') )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems