diff --git a/Exercises/1-callback.js b/Exercises/1-callback.js
index 8270a12..69c423c 100644
--- a/Exercises/1-callback.js
+++ b/Exercises/1-callback.js
@@ -1,5 +1,15 @@
'use strict';
-const iterate = (obj, callback) => null;
+const iterate = (obj, callback) => {
+ if (!obj) {
+ callback(new Error('obj needed'));
+ return;
+ }
+ for (const key of Object.keys(obj)) {
+ callback(key, obj[key], obj);
+ }
+ return;
+};
module.exports = { iterate };
+
diff --git a/Exercises/2-closure.js b/Exercises/2-closure.js
index 0f07103..db0c011 100644
--- a/Exercises/2-closure.js
+++ b/Exercises/2-closure.js
@@ -1,5 +1,6 @@
'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..789970e 100644
--- a/Exercises/3-wrapper.js
+++ b/Exercises/3-wrapper.js
@@ -1,5 +1,19 @@
'use strict';
-const contract = (fn, ...types) => null;
+const contract = (fn, ...types) => (...arr) => {
+ for (let i = 0; i < types.length - 1; i++) {
+ const argType = typeof arr[i];
+ const neededArgType = types[i].name.toLowerCase();
+ if (argType !== neededArgType) {
+ throw new TypeError('Types are different');
+ }
+ }
+ const neededReType = types[types.length - 1].name.toLowerCase();
+ const result = fn(...arr);
+ if (typeof result !== neededReType) {
+ throw new TypeError('Types are different');
+ }
+ return result;
+};
module.exports = { contract };
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