diff --git a/.eslintrc.json b/.eslintrc.json
index 188baf7..9b0f412 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -18,7 +18,7 @@
     ],
     "linebreak-style": [
       "error",
-      "unix"
+      "windows"
     ],
     "quotes": [
       "error",
@@ -265,4 +265,4 @@
       "never"
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/Exercises/1-random.js b/Exercises/1-random.js
index ef5ccaf..457e0b5 100644
--- a/Exercises/1-random.js
+++ b/Exercises/1-random.js
@@ -1,9 +1,12 @@
 'use strict';
 
 const random = (min, max) => {
-  // Generate random Number between from min to max
-  // Use Math.random() and Math.floor()
-  // See documentation at MDN
+  if (max === undefined) {
+    max = min;
+    min = 0;
+  }
+
+  return Math.floor(Math.random() * (max - min) + min);
 };
 
 module.exports = { random };
diff --git a/Exercises/2-key.js b/Exercises/2-key.js
index ba7e53a..f075d2b 100644
--- a/Exercises/2-key.js
+++ b/Exercises/2-key.js
@@ -1,9 +1,14 @@
 'use strict';
 
 const generateKey = (length, possible) => {
-  // Generate string of random characters
-  // Use Math.random() and Math.floor()
-  // See documentation at MDN
+  let result = '';
+
+  for (let i = 0; i < length; i++) {
+    const ranIdx = Math.floor(Math.random() * possible.length);
+    result += possible[ranIdx];
+  }
+
+  return result;
 };
 
 module.exports = { generateKey };
diff --git a/Exercises/3-ip.js b/Exercises/3-ip.js
index 1e2c406..9b3bd4e 100644
--- a/Exercises/3-ip.js
+++ b/Exercises/3-ip.js
@@ -1,11 +1,8 @@
 '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 bitwise shift
-  // (10 << 8 << 8 << 8) + (0 << 8 << 8) + (0 << 8) + 1 === 167772161
-  // Use Array.prototype.reduce of for loop
+  const ipSplit = ip.split('.');
+  return ipSplit.reduce((acc, val) => (acc << 8) + parseInt(val), 0);
 };
 
 module.exports = { ipToInt };
diff --git a/Exercises/4-methods.js b/Exercises/4-methods.js
index c1038e8..8811d2f 100644
--- a/Exercises/4-methods.js
+++ b/Exercises/4-methods.js
@@ -1,21 +1,16 @@
 '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 collection = [];
+
+  for (const key in iface) {
+    collection.push([
+      iface[key].name,
+      iface[key].length
+    ]);
+  }
+
+  return collection;
 };
 
 module.exports = { methods };