diff --git a/array/binary_search.dart b/array/binary_search.dart
new file mode 100644
index 0000000..91b5dec
--- /dev/null
+++ b/array/binary_search.dart
@@ -0,0 +1,31 @@
+import 'package:test/test.dart';
+
+
+int bin_search(List<int> numbers, int tar) {
+  int l = 0, r = numbers.length - 1;
+
+  while (l <= r) {
+    int mid = (l + r) ~/ 2;
+
+    if (numbers[mid] == tar) {
+      return mid;
+    } else if (numbers[mid] < tar) {
+      l = mid + 1;
+    } else {
+      r = mid - 1;
+    }
+  }
+
+  return -1; // Not found
+}
+
+
+void main() {
+  test('test 1 - found', () {
+    expect(bin_search([1, 2, 3, 4], 3), 2);
+  });
+
+  test('test 2 - not found', () {
+    expect(bin_search([1, 2, 3, 4, 7], 12), -1);
+  });
+}