Data update

Task/Symmetric-difference/MiniScript/symmetric-difference.mini

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+Set = new map
+Set["set"] = {}
+
+Set.init = function(items)
+	set = new Set
+	set.set = {}
+	for item in items
+		set.add(item)
+	end for
+	return set
+end function
+
+Set.contains = function(item)
+	return self.set.hasIndex(item)
+end function
+
+Set.items = function
+	return self.set.indexes
+end function
+
+Set.add = function(item)
+	self.set[item] = true
+end function
+
+Set.union = function(other)
+	result = Set.init
+	result.set = self.set + other.set
+	return result
+end function
+
+Set.difference = function(other)
+	result = Set.init
+	for item in self.items
+		if not other.contains(item) then result.add(item)
+	end for
+	return result
+end function
+
+Set.symmetricDifference = function(other)
+	diff1 = self.difference(other)
+	diff2 = other.difference(self)
+	return diff1.union(diff2)
+end function
+
+a = ["John", "Serena", "Bob", "Mary", "Serena"]
+b = ["Jim", "Mary", "John", "Jim", "Bob"]
+
+A1 = Set.init(a)
+B1 = Set.init(b)
+
+print "A XOR B " + A1.symmetricDifference(B1).items
+print "A - B " + A1.difference(B1).items
+print "B - A " + B1.difference(A1).items