WIP server side.

server/src/collection/NestedSet/index.js

@@ -0,0 +1,73 @@
+
+export default class NestedSet {
+  /**
+   * Constructor method.
+   * @param {Object} options -
+   */
+  constructor(items, options) {
+    this.options = {
+      parentId: 'parent_id',
+      id: 'id',
+      ...options,
+    };
+    this.items = items;
+    this.collection = {};
+    this.toTree();
+
+    return this.collection;
+  }
+
+  /**
+   * Link nodes children.
+   */
+  linkChildren() {
+    if (this.items.length <= 0) return false;
+
+    const map = {};
+    this.items.forEach((item) => {
+      map[item.id] = item;
+      map[item.id].children = [];
+    });
+
+    this.items.forEach((item) => {
+      const parentNodeId = item[this.options.parentId];
+      if (parentNodeId) {
+        map[parentNodeId].children.push(item);
+      }
+    });
+    return map;
+  }
+
+  toTree() {
+    const map = this.linkChildren();
+    const tree = {};
+
+    this.items.forEach((item) => {
+      const parentNodeId = item[this.options.parentId];
+      if (!parentNodeId) {
+        tree[item.id] = map[item.id];
+      }
+    });
+    this.collection = Object.values(tree);
+  }
+
+  walk() {
+
+  }
+
+  getParents() {
+
+  }
+
+  getChildren() {
+    
+  }
+
+  toFlattenArray() {
+
+  }
+
+  toArray() {
+
+  }
+}