diff --git a/Exercises/1-callback.js b/Exercises/1-callback.js
index 8270a12..ccde3b3 100644
--- a/Exercises/1-callback.js
+++ b/Exercises/1-callback.js
@@ -1,5 +1,10 @@
'use strict';
-const iterate = (obj, callback) => null;
+const iterate = (object, callback) => {
+ for (const key in object) {
+ const value = object[key];
+ callback(key, value, object);
+ }
+};
module.exports = { iterate };
diff --git a/Exercises/2-closure.js b/Exercises/2-closure.js
index 0f07103..7b71264 100644
--- a/Exercises/2-closure.js
+++ b/Exercises/2-closure.js
@@ -1,5 +1,5 @@
'use strict';
-const store = x => null;
+const store = x => () => x;
module.exports = { store };
diff --git a/Exercises/3-wrapper.js b/Exercises/3-wrapper.js
index fb7207e..fd1441b 100644
--- a/Exercises/3-wrapper.js
+++ b/Exercises/3-wrapper.js
@@ -1,5 +1,24 @@
'use strict';
-const contract = (fn, ...types) => null;
+const contract = (fn, ...types) => (...args) => {
+ args.forEach((arg, index) => {
+ const typeName = types[index].name.toLowerCase();
+ const argType = typeof arg;
+ if (typeName !== argType) {
+ throw new TypeError(`Argument type expected:
+ ${typeName}, got: ${argType}`);
+ }
+ });
+ const result = fn(...args);
+ const expectedResultType = types[types.length - 1].name.toLowerCase();
+ const resultType = typeof result;
+
+ if (expectedResultType !== resultType) {
+ throw new TypeError(`Result type expected:
+ ${expectedResultType}, got: ${resultType}`);
+ }
+
+ return result;
+};
module.exports = { contract };
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