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ddebernardy/ruby-mutable-hash-key.rb

Last active December 29, 2015 06:29
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Breaking Ruby hashes with mutable keys
Raw
ruby-mutable-hash-key.rb
>> k = {}
=> {}
>> h = {k => :v}
=> {{}=>:v}
>> k[:broken] = :yes
=> :yes
>> h
=> {{:broken=>:yes}=>:v}
>> h[k]
=> nil
>> h[{:broken=>:yes}]
=> nil
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