code from chapter 5 in javascript

05_hash_tables/javascript/01_price_of_groceries.js

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+'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 }

05_hash_tables/javascript/02_check_voter.js

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+'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!