Closures are a very convenient and compact way to inject a behaviour without having to create a dedicated function. But those closures should be used only if the behaviour to be injected can be defined in a few lines of code, otherwise the source code can quickly become unreadable. ifdef::env-github,rspecator-view[] ''' == Implementation Specification (visible only on this page) include::message.adoc[] include::parameters.adoc[] ''' == Comments And Links (visible only on this page) include::../comments-and-links.adoc[] endif::env-github,rspecator-view[]