Nodes, edges, and walkers can have abilities. The body of an ability is specified with an
opening and closing braces ( { } ) within the specification of a node, edge, or walker and
specify a unit of execution.
Abilities are most closely analogous to methods in a traditional object oriented program, however they do not have the same semantics of a traditional function. An ability can only interact within the scope of context and local variables of the node/edge/walker for which it is affixed and do not have a return semantic. (Though it is important to note, that abilities can always access the scope of the executing walker using the visitor special variable as described below)
When using abilities, a developer can think of these as self-contained in-memory/in-data compute operations.