feat(typescript): add ts solution for leetcode 297

Author: MichaelSolati

typescript/0297-serialize-and-deserialize-binary-tree.ts

@@ -0,0 +1,54 @@
+/**
+ * Definition for a binary tree node.
+ * class TreeNode {
+ *     val: number
+ *     left: TreeNode | null
+ *     right: TreeNode | null
+ *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
+ *         this.val = (val===undefined ? 0 : val)
+ *         this.left = (left===undefined ? null : left)
+ *         this.right = (right===undefined ? null : right)
+ *     }
+ * }
+ */
+
+/*
+ * Encodes a tree to a single string.
+ */
+function serialize(root: TreeNode | null): string {
+    const box = [];
+
+    function cereal(root: TreeNode | null) {
+        if (root === null) return box.push(null);
+        box.push(root.val);
+        cereal(root.left);
+        cereal(root.right);
+    }
+    cereal(root);
+
+    return box.join(',');
+};
+
+/*
+ * Decodes your encoded data to tree.
+ */
+function deserialize(data: string): TreeNode | null {
+    const box: string[] = data.split(',');
+
+    function decereal(): TreeNode | null {
+        const val = box.shift();
+        if (val === '') return null;
+        const node = new TreeNode(Number(val));
+        node.left = decereal();
+        node.right = decereal();
+        return node;
+    }
+
+    return decereal();
+};
+
+
+/**
+ * Your functions will be called as such:
+ * deserialize(serialize(root));
+ */