feat: solution for 'Повторный экзамен #2: Граф с рефлексией на код'

src/index.js

@@ -1,5 +1,83 @@
-const Graph = require('./graph');
+class Graph {
+  constructor() {
+    this.adj = new Map();
+    this[Graph._logSymbol] = [];
+  }
 
-module.exports = {
-  Graph
-};
+  addNode(node) {
+    if (!this.adj.has(node)) {
+      this.adj.set(node, new Set());
+    }
+  }
+
+  addEdge(u, v) {
+    if (!this.adj.has(u)) this.adj.set(u, new Set());
+    if (!this.adj.has(v)) this.adj.set(v, new Set());
+
+    const uSet = this.adj.get(u);
+    const vSet = this.adj.get(v);
+
+    if (!uSet.has(v)) {
+      uSet.add(v);
+      vSet.add(u);
+    }
+  }
+
+  removeNode(node) {
+    if (!this.adj.has(node)) return;
+    for (const neighbor of this.adj.get(node)) {
+      this.adj.get(neighbor).delete(node);
+    }
+    this.adj.delete(node);
+  }
+
+  removeEdge(u, v) {
+    if (this.adj.has(u)) this.adj.get(u).delete(v);
+    if (this.adj.has(v)) this.adj.get(v).delete(u);
+  }
+
+  getNeighbors(node) {
+    return this.adj.has(node) ? Array.from(this.adj.get(node)) : [];
+  }
+
+  hasEdge(u, v) {
+    return this.adj.has(u) && this.adj.get(u).has(v);
+  }
+
+  getNodes() {
+    return Array.from(this.adj.keys());
+  }
+
+  getLog() {
+    return this[Graph._logSymbol].slice();
+  }
+}
+
+Graph._logSymbol = Symbol('log');
+
+function createGraph() {
+  const graph = new Graph();
+
+  const handler = {
+    get(target, prop, receiver) {
+      const value = target[prop];
+      if (typeof value === 'function') {
+        // Mutating methods that should be logged
+        if (['addNode', 'addEdge', 'removeNode', 'removeEdge'].includes(prop)) {
+          return function (...args) {
+            const result = value.apply(target, args);
+            target[Graph._logSymbol].push({ method: prop, args });
+            return result;
+          };
+        }
+        // Non-mutating methods (including getLog)
+        return value.bind(target);
+      }
+      return value;
+    },
+  };
+
+  return new Proxy(graph, handler);
+}
+
+module.exports = { Graph, createGraph };