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Contents
# TITLE:
#
# Reverse Merge
#
# SUMMARY:
#
# Like merge, but give the parameter priority over the
# reciever.
#
# CREDITS:
#
# - Gavin Sinclair
# - Thomas Sawyer
class Hash
# Allows for reverse merging where its the keys in the
# calling hash that wins over those in the <tt>other_hash</tt>.
# This is particularly useful for initializing an incoming
# option hash with default values:
#
# def setup(options = {})
# options.reverse_merge! :size => 25, :velocity => 10
# end
#
# The default :size and :velocity is only set if the +options+
# passed in doesn't already have those keys set.
def reverse_merge(other)
other.merge(self)
end
def reverse_merge!(other)
replace(reverse_merge(other))
end
alias_method :reverse_update, :reverse_merge!
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestHashReverseMerge < Test::Unit::TestCase
def test_reverse_merge
h1 = { :a=>1, :b=>2, :c=>2 }
h2 = { :c=>3 }
h3 = h1.reverse_merge(h2) )
assert_equal( 2, h3[:c] )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems