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Contents
class Hash
# Converts all keys in the Hash accroding to the given block.
# If the block return +nil+ for given key, then that key will be
# left intact.
#
# foo = { :name=>'Gavin', :wife=>:Lisa }
# foo.normalize_keys{ |k| k.to_s } #=> { "name"=>"Gavin", "wife"=>:Lisa }
# foo.inspect #=> { :name =>"Gavin", :wife=>:Lisa }
#
#--
# Adapted from Gavin Sinclair's #convert_keys.
#++
def normalize_keys( &block )
dup.send(:normalize_keys!, &block)
end
# Synonym for Hash#normalize_keys, but modifies the receiver in place (and returns it).
#
# foo = { :name=>'Gavin', :wife=>:Lisa }
# foo.normalize_keys!{ |k| k.to_s } #=> { "name"=>"Gavin", "wife"=>:Lisa }
# foo.inspect #=> { "name"=>"Gavin", "wife"=>:Lisa }
#
#--
# Adapted from Gavin Sinclair's #convert_keys.
#++
def normalize_keys!( &block )
keys.each{ |k|
nk = block[k]
self[nk]=delete(k) if nk
}
self
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestHash < Test::Unit::TestCase
def test_01
foo = { :a=>1, :b=>2 }
assert_equal( { "a"=>1, "b"=>2 }, foo.normalize_keys{|k|k.to_s} )
assert_equal( { :a =>1, :b=>2 }, foo )
end
def test_02
foo = { :a=>1, :b=>2 }
assert_equal( { "a"=>1, "b"=>2 }, foo.normalize_keys!{|k|k.to_s} )
assert_equal( { "a"=>1, "b"=>2 }, foo )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems