Example implementation

• Class: define a class to resolve the problem
• Methods: define a method to contain the logic
• Argument: the method should take the input as argument
• Strings: input and output of the class method are strings
• Assignment: assign some objects to local variables
• Variables: define references to created objects
• Loops: iterate on every character of the input string
• Objects: create a object of class StringBuilder to store the transcription
• Return values: method should return the final transcription
• Pattern matching: match the right operation to execute depending on the input value
• Error handling: manage the scenario when an invalid value is found

• use conditional instead of pattern matching to choose the right operation to execute for the input value

• use stream instead of loops to iterate on input values and map operation with a method reference to transform the data