diff --git a/05_hash_tables/01_price_of_groceries.js b/05_hash_tables/01_price_of_groceries.js
new file mode 100644
index 0000000..a95d3d2
--- /dev/null
+++ b/05_hash_tables/01_price_of_groceries.js
@@ -0,0 +1,10 @@
+'use strict';
+
+const book = {};
+// an apple costs 67 cents
+book['apple'] = 0.67;
+// milk costs $1.49
+book['milk'] = 1.49;
+book['avocado'] = 1.49;
+
+console.log(book); // { apple: 0.67, milk: 1.49, avocado: 1.49 }
diff --git a/05_hash_tables/02_check_voter.js b/05_hash_tables/02_check_voter.js
new file mode 100644
index 0000000..288eba6
--- /dev/null
+++ b/05_hash_tables/02_check_voter.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const voted = {};
+function check_voter(name) {
+  if (voted[name]) {
+    console.log('kick them out!');
+  } else {
+    voted[name] = true;
+    console.log('let them vote!');
+  }
+}
+
+
+check_voter("tom"); // let them vote!
+check_voter("mike"); // let them vote!
+check_voter("mike"); // kick them out!