Emits an event to a specified group.
The name of the group to emit the event to.
The method name to be called on the group.
Additional parameters to be passed to the method.
Iterates over a specified group and executes a callback function for each context.
The name of the group to iterate over.
The callback function to be executed for each context.
Interface representing a group emitter that can emit events to a group and iterate over a group.