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Task/Symmetric-difference/D/symmetric-difference.d

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+import std.stdio, std.algorithm, std.array;
+
+struct Set(T) {
+    immutable T[] items;
+
+    Set opSub(in Set other) const /*pure nothrow*/ {
+        return Set(array(filter!(a=> !canFind(other.items,a))(items)));
+    }
+
+    Set opAdd(in Set other) const /*pure nothrow*/ {
+        return Set(this.items ~ (other - this).items);
+    }
+}
+
+Set!T symmetricDifference(T)(in Set!T left, in Set!T right) {
+    return (left - right) + (right - left);
+}
+
+void main() {
+    immutable A = Set!string(["John", "Bob", "Mary", "Serena"]);
+    immutable B = Set!string(["Jim", "Mary", "John", "Bob"]);
+
+    writeln("        A\\B: ", (A - B).items);
+    writeln("        B\\A: ", (B - A).items);
+    writeln("A symdiff B: ", symmetricDifference(A, B).items);
+}