How can you handle optional fields in Protocol Buffers?
- Use the required keyword to specify the field is mandatory.
- Use the optional keyword to specify the field is optional.
- Use default values for fields that are optional.
- Use the optional keyword with a custom default value.
In Protocol Buffers, fields are optional by default. You do not need to use the optional keyword. Instead, to handle optional fields, you can simply omit them when not needed, and Protocol Buffers will use the default value specified in the message schema. Using the required keyword is not recommended, as it enforces a field to always be present, making it challenging to evolve the schema in the future. Using the optional keyword with a custom default value can be useful when you want to specify a different default value other than the Proto3's default value for that type.
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