This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.
Remapping the Keys and Values of A Hash | ||
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Code | Expected | Actual |
class Hash def tied_with(hash) remap do |h,key,value| h[hash[key]] = value end.delete_if { |key,value| key.nil? || value.nil? } end def remap(hash={}) each { |k,v| yield hash, k, v } hash end end a = {1 => 2, 3 => 4} b = {1 => 'foo', 3 => 'bar'} a.tied_with(b) |
{"foo"=>2, "bar" =>4} | {"foo"=>2, "bar"=>4} |
b.tied_with(a) |
{2=>"foo", 4=>"bar"} | {2=>"foo", 4=>"bar"} |