Update README.md

abroroo · web-flow · commit 870d134b2f73 · 2023-03-01T15:03:42.000+09:00
diff --git a/README.md b/README.md
@@ -23,17 +23,21 @@ List is periodically updated
 const isSymmetric = function(root) {
     // tree with null root considered symmetric
     if (root == null) return true
+    
     // check if same first two nodes of the root
     return isSame(root.left, root.right)
 };
 
 const isSame = (leftN, rightN) => {
     // if both nodes are null then tree symmetric
     if (leftN == null && rightN == null) return true
+    
     // if only one of them null, no longer symmetric
     if (leftN == null || rightN == null) return false
+    
     // if two values are not equal , not symmetric
     if (leftN.val !== rightN.val) return false
+    
     // recursivly check both outer sides of the seconf node and inner sides respectively all over the height of the tree
     return isSame(leftN.left, rightN.right) && isSame(leftN.right, rightN.left);
 }
