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? Nov 1, 2025 · Optional positional parameters bring flexibility when you want to let callers skip certain values. Dart marks these by wrapping them in square brackets []. If the caller leaves them out, the parameters default to null, unless a default is provided.
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