HowProgrammingWorks · vladimirvikulin · Oct 12, 2021
diff --git a/.eslintrc.json b/.eslintrc.json
@@ -18,7 +18,7 @@
    ],
    "linebreak-style": [
      "error",
-      "unix"
+      "windows"
    ],
    "quotes": [
      "error",

diff --git a/Exercises/1-random.js b/Exercises/1-random.js
@@ -1,9 +1,11 @@
 '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 + 1)) + min;
 };
-
 module.exports = { random };
+
diff --git 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
+const generateKey = (length, characters) => {
+  const len = characters.length;
+  let res = '';
+  for (let i = 0; i < length; i++) {
+    const position = Math.floor(Math.random() * len);
+    res += characters[position];
+  }
+  return res;
 };
-
 module.exports = { generateKey };
diff --git 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 ipNumber = ip.split('.')
+    .reduce((sum, cur) => (sum << 8) + parseInt(cur));
+  return ipNumber;
 };
-
 module.exports = { ipToInt };
diff --git a/Exercises/4-methods.js b/Exercises/4-methods.js
@@ -1,21 +1,24 @@
 '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) => {
+  const res = [];
+  for (const name in iface) {
+    const func = iface[name];
+    if (typeof func === 'function') {
+      res.push([func.name, func.length]);
+    }
+  }
+  return res;
 };
-
+const obj = {
+  m1: (x) => [x],
+  m2(x, y) {
+    return [x, y];
+  },
+  m3(x, y, z) {
+    return [x, y, z];
+  }
+};
+const res = methods(obj);
+console.log(res);
 module.exports = { methods };