fix(parent_topic): Be able to unsubscribe all childs from giving a paren...

[pipo02mix]

Implement clearing subscriptions by topic parent like this (before it was not working):

PubSub.subscribe('a', myFunc1);
PubSub.subscribe('a.b', myFunc2);
PubSub.subscribe('a.b.c', myFunc3);

PubSub.unsubscribe('a.b');
// no further notications for 'a.b' and 'a.b.c' topics
// notifications for 'a' will still get published

[mroderick]

Thank you for your pull request 👍

Please provide a failing test that only passes with your implementation in place

[pipo02mix]

Indeed there is a feature more than a fix. I thought by default unsubscribe clear the current node and all its children. My proposal, is to add a extra boolean argument (false by default) allowing remove all subscriptions of the topic passed and its children topics.

PubSub.subscribe('a', myFunc1);
PubSub.subscribe('a.b', myFunc2);
PubSub.subscribe('a.b.c', myFunc3);

PubSub.unsubscribe('a.b', true);
// no further notifications for 'a.b' and 'a.b.c' topics
// with the optional second argument equals to true, all subscribers are removed for children topics
// notifications for 'a' will still get published

[mroderick]

I believe this feature was implemented with #97. Do you agree?

[pipo02mix]

@mroderick Yes, it what I expected. Thanks