isOptional

abstract val isOptional: Boolean(source)

true if this parameter is optional and can be omitted when making a call via KCallable.callBy, or false otherwise.

A parameter is optional in any of the two cases:

  1. The default value is provided at the declaration of this parameter.

  2. The parameter is declared in a member function and one of the corresponding parameters in the super functions is optional.

Since Kotlin

1.0