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Manipulate a List or Set using JavaScript

This seems like a simple task but Im unable to find examples on doing this. I have the following attribute of type Set in my component and I want to use javascript to add/remove items. How is this best accomplished in Lightning JavaScript?

<aura:attribute name="emailList" type="Set" default="[]" description="The list of selected email addresses." />
or
<aura:attribute name="emailList" type="List" default="[]" description="The list of selected email addresses." />