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jlulian38@jlulian38-laptop-revived:~$ irb
irb(main):001:0> 'I <3 Ruby'.length
=> 9
irb(main):002:0> str = 'I <3 Ruby'
=> "I <3 Ruby"
irb(main):003:0> str ['<3'] = "love"
=> "love"
irb(main):004:0> str
=> "I love Ruby"
irb(main):005:0> ":D"
=> ":D"