binary tree level order traversal / 以�

Author: JustDevRae

JustDevRae/Tree/binary_tree_level_order_traversal.js

@@ -0,0 +1,23 @@
+function levelOrder(root) {
+  if (!root) return [];
+
+  let result = [];
+  let queue = [root];
+
+  while (queue.length > 0) {
+    let level = [];
+    let size = queue.length;
+
+    for (let i = 0; i < size; i++) {
+      let node = queue.shift();
+      level.push(node.val);
+
+      if (node.left) queue.push(node.left);
+      if (node.right) queue.push(node.right);
+    }
+
+    result.push(level);
+  }
+
+  return result;
+}