✅ [20] stack

Author: enkr1

20/my_solution.js

@@ -3,7 +3,11 @@
  * @return {boolean}
  */
 const isValid = (str) => {
-  let map = new Map(), openStack = [], char = str.split("");
+  let char = str.split("");
+
+  if (1 === char.length) return false;
+
+  let map = new Map(), openStack = [];
 
   map.set("{", "}");
   map.set("(", ")");

20/solution.js

@@ -0,0 +1,28 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+const isValid = (str) => {
+  let char = str.split(""), map = new Map(), openStack = [];
+
+  map.set("{", "}");
+  map.set("(", ")");
+  map.set("[", "]");
+
+  for (let i = 0; i < char.length; i++) {
+    let isClosing = [")", "]", "}"].includes(char[i]);
+    if (0 === openStack.length && isClosing) return false;
+
+    if (isClosing) {
+      if (map.get(openStack[openStack.length - 1]) === char[i]) {
+        openStack.pop();
+      } else {
+        return false;
+      }
+    } else {
+      openStack.push(char[i]);
+    }
+  }
+
+  return 0 === openStack.length;
+};