diff --git a/Exercises/1-random.js b/Exercises/1-random.js
index ef5ccaf..d082376 100644
--- a/Exercises/1-random.js
+++ b/Exercises/1-random.js
@@ -1,9 +1,7 @@
 'use strict';
 
-const random = (min, max) => {
-  // Generate random Number between from min to max
-  // Use Math.random() and Math.floor()
-  // See documentation at MDN
-};
+const random = (min, max) => //Generate random Number between from min to max;
+  //Solution is not short
+  Math.floor(Math.random() * (max - min) + min);
 
 module.exports = { random };
diff --git a/Exercises/2-key.js b/Exercises/2-key.js
index ba7e53a..96f761b 100644
--- a/Exercises/2-key.js
+++ b/Exercises/2-key.js
@@ -1,9 +1,12 @@
 'use strict';
 
 const generateKey = (length, possible) => {
-  // Generate string of random characters
-  // Use Math.random() and Math.floor()
-  // See documentation at MDN
+  let result = '';
+  while (result.length < length) {
+    const randomIdx = Math.floor(Math.random() * possible.length);
+    result += possible[randomIdx];
+  }
+  return result;
 };
 
 module.exports = { generateKey };
diff --git a/Exercises/3-ip.js b/Exercises/3-ip.js
index 5b448dd..4903591 100644
--- a/Exercises/3-ip.js
+++ b/Exercises/3-ip.js
@@ -1,11 +1,6 @@
 'use strict';
 
-const ipToInt = (ip = '127.0.0.1') => {
-  // Parse ip address as string, for example '10.0.0.1'
-  // to ['10', '0', '0', '1'] to [10, 0, 0, 1]
-  // and convert to Number value 167772161 with sitwise shift
-  // (10 << 8 << 8 << 8) + (0 << 8 << 8) + (0 << 8) + 1 === 167772161
-  // Use Array.prototype.reduce of for loop
-};
+const ipToInt = (ip = '127.0.0.1') => ip.split('.').reverse()
+  .reduce((sum, cur, i) =>  sum + (Number(cur) << i * 8), 0);
 
 module.exports = { ipToInt };
diff --git a/Exercises/4-methods.js b/Exercises/4-methods.js
index c1038e8..5132b56 100644
--- a/Exercises/4-methods.js
+++ b/Exercises/4-methods.js
@@ -1,21 +1,12 @@
 'use strict';
 
-const methods = iface => {
-  // Introspect all properties of iface object and
-  // extract function names and number of arguments
-  // For example: {
-  //   m1: x => [x],
-  //   m2: function (x, y) {
-  //     return [x, y];
-  //   },
-  //   m3(x, y, z) {
-  //     return [x, y, z];
-  //   }
-  // will return: [
-  //   ['m1', 1],
-  //   ['m2', 2],
-  //   ['m3', 3]
-  // ]
-};
+const methods = iface => Object.entries(iface)
+  .reduce((res, cur) => {
+    const value = cur[1];
+    if (typeof value === 'function') {
+      res.push([cur[0], value.length]);
+    }
+    return res;
+  }, []);
 
 module.exports = { methods };