Web Reference: Summary: In this tutorial, you’ll learn about Dart optional parameters and how to use them to make the functions more flexible. Introduction to Dart optional parameters Oct 22, 2025 · Named parameters are optional unless they're explicitly marked as required. When defining a function, use {param1, param2, …} to specify named parameters. If you don't provide a default value or mark a named parameter as required, their types must be nullable as their default value will be null: Nov 7, 2012 · When the parameter of a function is specified using "paramName : value" syntax, then it is a named parameter. Such parameters can be rendered optional by enclosing them between [ and ] brackets.
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