Convenience base class for FlowQuery Operations. You should set $shortName and optionally also $final and $priority when subclassing.

Adds the given items to the current context.

Count the number of elements in the context.

Get the first element inside the context.

Get a (non-wrapped) element from the context.

Check whether the at least one of the context elements match the given filter.

Get the last element inside the context.

Removes the given items from the current context.

Slice the current context

Removes duplicate items from the current context.