Guided Fluent Builder

Example of creating a product with a 'Guided Fluent Builder'

• The builder is a 'guided builder' with a sequence of steps.
• The builder first enforces the required properties.
• The builder then allows for all optional properties.

• The desired product can only be instantiated via the builder.
• Direct instantiation of a product is therefore prohibited.

• Only the interface of the product is exposed to the client.
• The resulting product is immutable.

• The builder has a fluent syntax.
• The builder handles a nested subclass with lambda syntax.