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  • Default User Avatar

    Broken formatting in the description for +, -, *.

  • Default User Avatar

    The type of this exception is not specified.

    Crystal: the sample tests expect ArgumentError.

  • Default User Avatar

    I suggest to change the estimated rank to 5 kyu.

  • Custom User Avatar
    • Random tests are very poor
    • Output format is not specified
    • Nothing is told about errors
    • It may not be clear that "stack-based" means that the user has to build a stack from the list of operations, and not that the input is in postfix notation (the input is not a stringified stack of operands and operators)
    • Interpreting Forth is very similar to implementing a postfix calculator; I wouldn't call it a duplicate, but it doesn't feel novel either