How does Groovy support named and default parameters?

Groovy methods can declare default values for parameters directly in the method signature, like def greet(String name, String greeting = 'Hello'), letting callers omit the greeting argument and have it default automatically without needing multiple overloaded method signatures.

True named-parameter method calls, using name: value syntax at the call site, work specifically through a map-based convention: a method accepting a single Map argument as its first parameter can be called with that map expressed as name: value pairs, giving the appearance of named arguments even though it's really passing one Map object.

Together, these features let Groovy APIs, and constructors, which support the same map-based named-argument convention for setting properties, read more like readable, self-documenting calls than Java's purely positional argument lists.

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