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HashのKeyにStringを使おうとすると、別のインスタンスが用いられる・・・場合がある

Ruby

Last updated at 2013-08-14Posted at 2013-05-12

str = 'str'
{str => 1}.key(1).eql? str   #=> true
{str => 1}.key(1).equal? str #=> false

str = 'str'.freeze
{str => 1}.key(1).eql? str   #=> true
{str => 1}.key(1).equal? str #=> true

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