when
Adds an Action to be executed when an object is added to this collection.
Like all, this method will cause all objects in this container to be realized.
Return
the supplied action
Parameters
action
The action to be executed
Adds a closure to be called when an object is added to this collection. The newly added object is passed to the closure as the parameter.
Like all, this method will cause all objects in this container to be realized.
Parameters
action
The closure to be called