From 98f119f0ed64ca0426b9a11e629273d5e6cb9669 Mon Sep 17 00:00:00 2001
From: orbis <infectores@gmail.com>
Date: Fri, 3 Jun 2022 22:20:18 +0300
Subject: [PATCH 1/2] fix example

---
 JavaScript/1-math.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/JavaScript/1-math.js b/JavaScript/1-math.js
index 0b8ae4d..5268847 100644
--- a/JavaScript/1-math.js
+++ b/JavaScript/1-math.js
@@ -1,7 +1,6 @@
 'use strict';
 
-const { sin } = Math;
-const π = Math.PI;
+const { sin, PI: π } = Math;
 
 const inverse = f => x => 1 / f(x);
 

From b5668faf395ba14369db9ebdeb30b806c1bc1d85 Mon Sep 17 00:00:00 2001
From: orbis <infectores@gmail.com>
Date: Fri, 3 Jun 2022 23:09:28 +0300
Subject: [PATCH 2/2] homework

---
 Exercises/1-callback.js |  8 +++++++-
 Exercises/2-closure.js  |  2 +-
 Exercises/3-wrapper.js  | 19 ++++++++++++++++++-
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/Exercises/1-callback.js b/Exercises/1-callback.js
index 8270a12..808648c 100644
--- a/Exercises/1-callback.js
+++ b/Exercises/1-callback.js
@@ -1,5 +1,11 @@
 'use strict';
 
-const iterate = (obj, callback) => null;
+const iterate = (obj, callback) => {
+  const keys = Object.keys(obj);
+  for (const key of keys) {
+    const value = obj[key];
+    callback(key, value, obj);
+  }
+};
 
 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..96602ef 100644
--- a/Exercises/3-wrapper.js
+++ b/Exercises/3-wrapper.js
@@ -1,5 +1,22 @@
 'use strict';
 
-const contract = (fn, ...types) => null;
+const contract = (fn, ...types) => (...args) => {
+
+  for (let i = 0; i < types.length - 1; i++) {
+    const arg = args[i];
+    const curType = types[i].name.toLowerCase();
+
+    if (typeof arg !== curType) {
+      throw TypeError(`argument ${args[i]} is not a ${types[i].name}`);
+    }
+  }
+
+  const result = fn(...args);
+  const resultType = types[types.length - 1].name.toLowerCase();
+  if (typeof result !== resultType) {
+    throw TypeError(`result ${result} is not a ${resultType}`);
+  }
+  return result;
+};
 
 module.exports = { contract };