Adding union find data structure

src/graphs/union-find/union-find.js

@@ -0,0 +1,24 @@
+const unionFind = (edges) => {
+    let parent = [];
+
+    for (let i = 0; i <= edges.length; i += 1) {
+        parent.push(i);
+    }
+
+    // finding the parent of p
+    const find = (p) => {
+        if (parent[p] === p) {
+            return p;
+        } else {
+            return find(parent[p]);
+        }
+    };
+
+    const union = (u, v) => {
+        let parentU = find(u);
+        let parentV = find(v);
+
+        // u becomes the parent of v ;
+        parent[parentU] = parentV;
+    };
+};