From 36c65ff54cabd426404fa12f8595dc07c5b6b82f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89rico=20Marshall?= <ericogmarshall1@gmail.com>
Date: Thu, 3 Feb 2022 20:48:39 -0300
Subject: [PATCH] exercicio concluido

---
 semana22/checaParenteses/index.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 semana22/checaParenteses/index.js

diff --git a/semana22/checaParenteses/index.js b/semana22/checaParenteses/index.js
new file mode 100644
index 0000000..1363ead
--- /dev/null
+++ b/semana22/checaParenteses/index.js
@@ -0,0 +1,26 @@
+function checaParenteses(str) {
+  const stack = [];
+
+  for (let char of str) {
+    if (char === "(" || char === "[" || char === "{") {
+      stack.push(char);
+    } else {
+      const lastOpeningChar = stack.pop();
+      if(!lastOpeningChar) {
+        return false
+      } else if (
+        (lastOpeningChar === "(" && char !== ")") ||
+        (lastOpeningChar === "[" && char !== "]") ||
+        (lastOpeningChar === "{" && char !== "}")
+      ) {
+        return false;
+      }
+    }
+  }
+
+  if (stack.length > 0) {
+    return false;
+  }
+
+  return true;
+}
\ No newline at end of file