Data commit

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

@@ -0,0 +1,27 @@
+import std.stdio, std.algorithm, std.array;
+
+struct Set(T) {
+    immutable T[] items;
+
+    Set opSub(in Set other) const pure nothrow {
+        return items.filter!(x => !other.items.canFind(x)).array.Set;
+    }
+
+    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)
+pure nothrow {
+    return (left - right) + (right - left);
+}
+
+void main() {
+    immutable A = ["John", "Bob", "Mary", "Serena"].Set!string;
+    immutable B = ["Jim", "Mary", "John", "Bob"].Set!string;
+
+    writeln("        A\\B: ", (A - B).items);
+    writeln("        B\\A: ", (B - A).items);
+    writeln("A symdiff B: ", symmetricDifference(A, B).items);
+}