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Contents
# TITLE:
#
# Hash Comparison Extensions
#
# SUMMARY:
#
# Hash comparison extensions.
#
# CREDITS:
#
# - Thomas Sawyer
#
class Hash
# Returns true or false whether the hash
# contains the given keys.
#
# h = { :a => 1, :b => 2 }
# h.has_keys?( :a ) #=> true
# h.has_keys?( :c ) #=> false
def has_keys?(*check_keys)
unknown_keys = check_keys - self.keys
return unknown_keys.empty?
end
# Returns true if the hash contains
# _only_ the given keys, otherwise false.
#
# h = { :a => 1, :b => 2 }
# h.has_only_keys?( :a, :b ) #=> true
# h.has_only_keys?( :a ) #=> false
def has_only_keys?(*check_keys)
unknown_keys = self.keys - check_keys
return unknown_keys.empty?
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestHashHasKeys < Test::Unit::TestCase
# TODO Write test for Hash#diff.
def test_has_keys?
assert( { :a=>1,:b=>2,:c=>3 }.has_keys?(:a,:b) )
assert( ! { :a=>1,:b=>2,:c=>3 }.has_keys?(:a,:b,:d) )
end
def test_has_only_keys?
assert( { :a=>1,:b=>2,:c=>3 }.has_only_keys?(:a,:b,:c) )
assert( ! { :a=>1,:b=>2,:c=>3 }.has_only_keys?(:a,:b) )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems