inital move of two ops

src/core/operations/SetUnion.mjs

@@ -0,0 +1,46 @@
+import SetOp from "./SetOps";
+
+/**
+ * 
+ */
+class SetUnion extends SetOp {
+
+    /**
+     * 
+     */
+    constructor() {
+        super();
+        this.setOp = this.runUnion;
+
+        this.name = "Set Union";
+        this.description = "Get the union of two sets";
+    }
+
+    /**
+     * Get the union of the two sets.
+     *
+     * @param {Object[]} a
+     * @param {Object[]} b
+     * @returns {Object[]}
+     */
+    runUnion(a, b) {
+        const result = {};
+
+        /**
+         * Only add non-existing items
+         * @param {Object} hash
+         */
+        const addUnique = (hash) => (item) => {
+            if (!hash[item]) {
+                hash[item] = true;
+            }
+        };
+
+        a.map(addUnique(result));
+        b.map(addUnique(result));
+
+        return Object.keys(result).join(this.itemDelimiter);
+    }
+}
+
+export default SetUnion;