refactoring

code/Context.js

@@ -1,6 +1,7 @@
 class Context {
-    constructor(level) {
-        this.level = 0;
+    constructor(level = 0, isLast = false) {
+        this.level = level;
+        this.isLast = isLast;
     }
 }
 

code/tree-logger.js

@@ -1,15 +1,20 @@
+const {Context} = require("./Context");
 const treeLogger = (tree, context) => {
     if (context.level === 0) {
         console.log(tree.name);
-        context.level += 1;
 
         if (tree.items) {
-            for (const subtree of tree.items) {
-                treeLogger(subtree, context);
+            for (let i = 0; i < tree.items.length; ++i) {
+                const subtree = tree.items[i];
+                const lastIndex = tree.items.length - 1;
+                const ctx = new Context(context.level + 1, (i === lastIndex));
+
+                treeLogger(subtree, ctx);
             }
         }
     } else if (context.level === 1) {
-        console.log('├── ' + tree.name);
+        const rootChar = context.isLast ? '└ ' : '├ ';
+        console.log(rootChar + tree.name);
     } else {
 
     }

task1.js

@@ -10,4 +10,4 @@ treeLogger({
         "name": 5,
         "items": [{ "name": 6 }]
     }]
-}, new Context(0));
+}, new Context());