add solution: valid-parentheses

Author: yihyun-kim1

valid-parentheses/yihyun-kim1.js

@@ -0,0 +1,18 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+const isValid = (s) => {
+  const stack = [];
+  const map = { ")": "(", "}": "{", "]": "[" };
+
+  for (const char of s) {
+    if (char === "(" || char === "{" || char === "[") {
+      stack.push(char);
+    } else {
+      if (stack.pop() !== map[char]) return false;
+    }
+  }
+
+  return stack.length === 0;
+};