diff --git a/demo.js b/demo.js
new file mode 100644
index 0000000..2a3bc39
--- /dev/null
+++ b/demo.js
@@ -0,0 +1,36 @@
+function isValid(s) {
+    const stack = [];
+    
+    for (let char of s) {
+      switch (char) {
+        case '(': case '[': case '{':
+          // If the character is an opening bracket, push it onto the stack.
+          stack.push(char);
+          break;
+        case ')':
+          if (stack.pop() !== '(') {
+            return false; // Mismatched closing bracket.
+          }
+          break;
+        case ']':
+          if (stack.pop() !== '[') {
+            return false; // Mismatched closing bracket.
+          }
+          break;
+        case '}':
+          if (stack.pop() !== '{') {
+            return false; // Mismatched closing bracket.
+          }
+          break;
+        default:
+          // If the character is not a bracket, ignore it.
+      }
+    }
+    
+    // After processing all characters, the stack should be empty if the string is valid.
+    return stack.length === 0;
+  }
+  
+  console.log(isValid("()")); // true
+console.log(isValid("()[]{}")); // true
+console.log(isValid("(]")); // false
diff --git a/text.text b/text.text
new file mode 100644
index 0000000..d444bcd
--- /dev/null
+++ b/text.text
@@ -0,0 +1 @@
+this is modified by Yazan Eleyan