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Contents
class Hash
# Returns a new hash built by iterating through each key,value
# pair and updating the new hash.
#
#--
# Note that this method may get some fine tuning as it
# currently expects the block to return a "mini-hash"
# pair -- parhaps a 2-element array woud be better?
#++
def collate # :yield:
newhash = {}
each_pair{ |k,v| newhash.update( yield(k,v) ) }
newhash
end
# In place version of #collate.
def collate!(&yld)
replace( collate(&yld) )
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_collate
a = { :a => 1, :b => 2, :c => 3 }
e = { :a => 2, :b => 3, :c => 4 }
assert_equal( e, a.collate{ |k,v| { k => v+1 } } )
end
def test_collate!
a = { :a => 1, :b => 2, :c => 3 }
e = { :a => 2, :b => 3, :c => 4 }
a.collate!{ |k,v| { k => v+1 } }
assert_equal( e, a )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems