RH Snip2

RHSnip2.cls

//Method consumes two sets of Ids and returns a map of sets
//Primarily used for comparison of existing and new memberships to see what existing records have to be removed
public static Map<String, Set<Id>> compareSets(Set<Id> setOne, Set<Id> setTwo) {
    Map<String, Set<Id>> comparisonMap = new Map<String, Set<Id>>{
        'In_First_Set' => new Set<Id>(),
        'Present_In_Both' => new Set<Id>(),
        'In_Second_Set' => new Set<Id>()
    };
    for (String setOneString : setOne) {
        if (setTwo.contains(setOneString))
            comparisonMap.get('Present_In_Both').add(setOneString);
        else
            comparisonMap.get('In_First_Set').add(setOneString);
    }
    for (String setTwoString : setTwo) {
        if (!setOne.contains(setTwoString))
            comparisonMap.get('In_Second_Set').add(setTwoString);
    }
    return comparisonMap;
}