Web Reference: Oct 22, 2025 · A function can have any number of required positional parameters. These can be followed either by named parameters or by optional positional parameters (but not both). Nov 7, 2012 · Dart supports both named optional parameters and positional optional parameters. What are the differences between the two? Also, how can you tell if an optional parameter was actually specified? Named arguments enable you to specify an argument for a parameter by matching the argument with its name rather than with its position in the parameter list. Optional arguments enable you to omit arguments for some parameters. Both techniques can be used with methods, indexers, constructors, and delegates.
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