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Jarvis is a Light-weight Library contains very useful functions, like NullCoalescing and TryParse for Java.
In class PlasticMetal.Jarvis.Common, CoalesceNull(a,b) equals a??b (as C# expression)
In class PlasticMetal.Jarvis.Parse, each TryParse function returns a TryResult, whose field Result represents whether the parsing succeeded or not, and field Out stores the output of parsing.