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Base62 Encoding Short Codes Discussion

Hi Chris,
why the local variable result is treated as frozen?
Here is the error:
Error:
ShortCodeTest#test_encode_10:
FrozenError: can't modify frozen String: ""
app/models/short_code.rb:20:in prepend'
app/models/short_code.rb:20:in
encode'
test/models/short_code_test.rb:15:in `block in class:ShortCodeTest'

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Sounds like you have a bug somewhere. Have you compared your code to the repository?

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the code is the same. If I initialize the local variable result with:
result =+"" or result = String.new
no errors, tests passing

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In my case works as expected, so compare again as suggested by Chris or maybe check ruby or rails version

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ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".freeze

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Chris,
I am very curious upon your decision to prepend the characters to the result string, instead of appending?

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