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Task/Symmetric-difference/JavaScript/symmetric-difference.js

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+// in A but not in B
+function relative_complement(A, B) {
+    return A.filter(function(elem) {return B.indexOf(elem) == -1});
+}
+
+// in A or in B but not in both
+function symmetric_difference(A,B) {
+    return relative_complement(A,B).concat(relative_complement(B,A));
+}
+
+var a = ["John", "Serena", "Bob", "Mary", "Serena"].unique();
+var b = ["Jim", "Mary", "John", "Jim", "Bob"].unique();
+
+print(a);
+print(b);
+print(symmetric_difference(a,b));