From a61400de658dc44c11c33d0a865027c3b4d18e09 Mon Sep 17 00:00:00 2001
From: Aditya Kumar <146847363+aditya-23140@users.noreply.github.com>
Date: Mon, 10 Feb 2025 01:01:46 +0530
Subject: [PATCH] Added missing solutions for problems in #video 83

Sir, I have tried to solve all questions on my own and now I am uploading all the solution. Please merge it if my solutions are ok.
Thank you,
Aditya
---
 Video 83/Solutions/02_solve.js   |   9 ++
 Video 83/Solutions/03_solve.js   |  10 ++
 Video 83/Solutions/04_solve.js   |  36 ++++++++
 Video 83/Solutions/05_solve.js   |   8 ++
 Video 83/Solutions/06_solve.js   |   8 ++
 Video 83/Solutions/08_solve.html |  30 ++++++
 Video 83/Solutions/09_solve.html |  41 ++++++++
 Video 83/Solutions/10_solve.html |  37 ++++++++
 Video 83/Solutions/11_solve.html | 154 +++++++++++++++++++++++++++++++
 Video 83/Solutions/12_solve.html |  39 ++++++++
 Video 83/Solutions/13_solve.html |  64 +++++++++++++
 Video 83/Solutions/14_solve.html |  35 +++++++
 12 files changed, 471 insertions(+)
 create mode 100644 Video 83/Solutions/02_solve.js
 create mode 100644 Video 83/Solutions/03_solve.js
 create mode 100644 Video 83/Solutions/04_solve.js
 create mode 100644 Video 83/Solutions/05_solve.js
 create mode 100644 Video 83/Solutions/06_solve.js
 create mode 100644 Video 83/Solutions/08_solve.html
 create mode 100644 Video 83/Solutions/09_solve.html
 create mode 100644 Video 83/Solutions/10_solve.html
 create mode 100644 Video 83/Solutions/11_solve.html
 create mode 100644 Video 83/Solutions/12_solve.html
 create mode 100644 Video 83/Solutions/13_solve.html
 create mode 100644 Video 83/Solutions/14_solve.html

diff --git a/Video 83/Solutions/02_solve.js b/Video 83/Solutions/02_solve.js
new file mode 100644
index 0000000..a3ad73f
--- /dev/null
+++ b/Video 83/Solutions/02_solve.js	
@@ -0,0 +1,9 @@
+let arr = [1, 2, 2, 3, 44, 54, 33, 44, 12, 2, 45];
+let copy = [...arr];
+arr[0] *= 2;
+for (let index = 1; index < arr.length; index++) {
+  if (arr[index] !== copy[index - 1]) {
+    arr[index] *= 2;
+  }
+}
+console.log(arr);
diff --git a/Video 83/Solutions/03_solve.js b/Video 83/Solutions/03_solve.js
new file mode 100644
index 0000000..c954af8
--- /dev/null
+++ b/Video 83/Solutions/03_solve.js	
@@ -0,0 +1,10 @@
+const reverse = (string) => {
+  let newString = "";
+  for (let i = string.length - 1; i >= 0; i--) {
+    newString += string[i];
+  }
+  return newString;
+};
+
+let result = reverse("Aditya");
+console.log(result);
diff --git a/Video 83/Solutions/04_solve.js b/Video 83/Solutions/04_solve.js
new file mode 100644
index 0000000..01d38d8
--- /dev/null
+++ b/Video 83/Solutions/04_solve.js	
@@ -0,0 +1,36 @@
+let password = "Aditya@2005";
+
+const passwordValidator = (password) => {
+  const regex = /^(?=.*[A-Z])(?=.*[a-z])(?=.*\d)(?=.*[\W_])[A-Za-z\d\W_]{8,}$/;
+  //   Regex Breakdown
+  // ^ → Start of the string
+  // (?=.*[A-Z]) → At least one uppercase letter
+  // (?=.*[a-z]) → At least one lowercase letter
+  // (?=.*\d) → At least one digit
+  // (?=.*[\W_]) → At least one special character (\W matches any non-word character, _ is included explicitly)
+  // [A-Za-z\d\W_]{8,} → Matches atleast 8 characters (letters, numbers, and special characters)
+  // $ → End of the string
+  return regex.test(password);
+};
+
+//Alternate
+function isValidString(str) {
+  if (str.length < 8) return false;
+
+  let hasUpper = false,
+    hasLower = false,
+    hasDigit = false,
+    hasSpecial = false;
+
+  for (let char of str) {
+    if (/[A-Z]/.test(char)) hasUpper = true;
+    if (/[a-z]/.test(char)) hasLower = true;
+    if (/\d/.test(char)) hasDigit = true;
+    if (/[\W_]/.test(char)) hasSpecial = true;
+  }
+
+  return hasUpper && hasLower && hasDigit && hasSpecial;
+}
+
+console.log(passwordValidator(password));
+console.log(isValidString(password));
diff --git a/Video 83/Solutions/05_solve.js b/Video 83/Solutions/05_solve.js
new file mode 100644
index 0000000..673e8dd
--- /dev/null
+++ b/Video 83/Solutions/05_solve.js	
@@ -0,0 +1,8 @@
+let arr = [1, 23, 12, 44, -23, 67];
+let sum = 0;
+for (const element of arr) {
+  if (element >= 0) sum += element;
+  else break;
+}
+
+console.log(sum);
diff --git a/Video 83/Solutions/06_solve.js b/Video 83/Solutions/06_solve.js
new file mode 100644
index 0000000..a092a05
--- /dev/null
+++ b/Video 83/Solutions/06_solve.js	
@@ -0,0 +1,8 @@
+const vowels = "aeiouAEIOU";
+let string = "Aditya Kumar Singh";
+let count = 0;
+for (const element of string) {
+  if (vowels.includes(element)) count++;
+}
+
+console.log(count);
diff --git a/Video 83/Solutions/08_solve.html b/Video 83/Solutions/08_solve.html
new file mode 100644
index 0000000..0c89bed
--- /dev/null
+++ b/Video 83/Solutions/08_solve.html	
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <script>
+    let numbers = [1, 23, 12, 33, 213, 46, 34];
+    const multiply = async (numbers) => {
+      return await Promise.all(numbers.map(num =>
+        new Promise(resolve => setTimeout(() => {
+          resolve(num * 2)
+        }, 500))
+      ))
+    }
+
+    multiply(numbers).then(result => console.log(result))
+    // alternate
+    // (async () => {
+    //     const result = await asyncDoubleArray([1, 2, 3, 4, 5]);
+    //     console.log(result); // Output: [2, 4, 6, 8, 10] after 500ms
+    //   })();
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/09_solve.html b/Video 83/Solutions/09_solve.html
new file mode 100644
index 0000000..8039c8b
--- /dev/null
+++ b/Video 83/Solutions/09_solve.html	
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <div class="order">
+    <div class="item"></div>
+    <div class="price"></div>
+  </div>
+  <button class="btn">Place Order</button>
+  <script>
+    let order = {
+      item: "ToothBrush",
+      cost: '10rs'
+    };
+    async function placeOrder(order, delay) {
+      return await new Promise(resolve => {
+        setTimeout(() => {
+          localStorage.setItem('Order', JSON.stringify(order));
+          resolve("Order Placed");
+        }, delay * 1000);
+      })
+    }
+    document.querySelector(".btn").addEventListener("click", () => {
+      let delay = Math.random() * 6 + 1;
+      placeOrder(order, delay).then(confirmation => {
+        document.querySelector(".btn").innerHTML = confirmation;
+        let data = JSON.parse(localStorage.getItem("Order"));
+        document.querySelector(".item").innerHTML = data.item;
+        document.querySelector(".price").innerHTML = data.cost;
+      });
+    })
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/10_solve.html b/Video 83/Solutions/10_solve.html
new file mode 100644
index 0000000..e46ca84
--- /dev/null
+++ b/Video 83/Solutions/10_solve.html	
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <button class="Espresso">Brew Espresso</button>
+  <script>
+    let coffeeDelay = {
+      "Espresso": 1732,
+      "Latte": 892,
+      "Cappuccino": 2054,
+      "Americano": 1500,
+      "Mocha": 627,
+      "Macchiato": 2345,
+      "Flat White": 1045
+    }
+    async function brewCoffee(coffee) {
+      return await new Promise(resolve => {
+        delay = coffeeDelay[coffee];
+        document.querySelector(`.${coffee}`).innerHTML = "Brewing...";
+        setTimeout(() => {
+          resolve(coffee + " brewed");
+        }, delay);
+      })
+    }
+    document.querySelector(".Espresso").addEventListener("click", () => {
+      brewCoffee("Espresso").then(resolve => document.querySelector(".Espresso").innerHTML = resolve);
+    })
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/11_solve.html b/Video 83/Solutions/11_solve.html
new file mode 100644
index 0000000..0575c9d
--- /dev/null
+++ b/Video 83/Solutions/11_solve.html	
@@ -0,0 +1,154 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+  <style>
+    body {
+      background-color: #1e1e1e;
+      font-family: sans-serif;
+      color: white;
+    }
+
+    h2 {
+      text-align: center;
+    }
+
+    table {
+      width: 100%;
+      border-collapse: collapse;
+      margin-top: 20px;
+    }
+
+    th,
+    td {
+      border: 1px solid #ddd;
+      padding: 10px;
+      text-align: left;
+    }
+
+    th {
+      background-color: #000000;
+    }
+    #filter{
+      padding: 0.5rem 0.9rem 0.5rem 0.5rem;
+      cursor: pointer;
+      background-color: #55fcffc7;
+      border: none;
+      border-radius: 0.2rem;
+    }
+    #filter:focus{
+      outline: none;
+    }
+  </style>
+</head>
+
+<body>
+  <div class="container">
+    <h2>Product List</h2>
+    <label for="filter">Filter Categories: </label>
+    <select name="filter" id="filter">
+      <option value="all">All</option>
+      <option value="Electronics">Electronics</option>
+      <option value="Footwear">Footwear</option>
+      <option value="Accessories">Accessories</option>
+      <option value="Wearable Tech">Wearable Tech</option>
+    </select>
+    <table id="productTable">
+      <thead>
+        <tr>
+          <th>ID</th>
+          <th>Name</th>
+          <th>Category</th>
+          <th>Price ($)</th>
+          <th>Stock</th>
+          <th>Rating</th>
+        </tr>
+      </thead>
+      <tbody>
+        <!-- Products will be inserted here -->
+      </tbody>
+    </table>
+  </div>
+  <script>
+    let products = [
+      {
+        "id": 1,
+        "name": "Wireless Mouse",
+        "category": "Electronics",
+        "price": 25.99,
+        "stock": 120,
+        "rating": 4.5
+      },
+      {
+        "id": 2,
+        "name": "Mechanical Keyboard",
+        "category": "Electronics",
+        "price": 79.99,
+        "stock": 75,
+        "rating": 4.7
+      },
+      {
+        "id": 3,
+        "name": "Running Shoes",
+        "category": "Footwear",
+        "price": 59.99,
+        "stock": 200,
+        "rating": 4.3
+      },
+      {
+        "id": 4,
+        "name": "Smart Watch",
+        "category": "Wearable Tech",
+        "price": 149.99,
+        "stock": 50,
+        "rating": 4.6
+      },
+      {
+        "id": 5,
+        "name": "Backpack",
+        "category": "Accessories",
+        "price": 39.99,
+        "stock": 180,
+        "rating": 4.2
+      }
+    ]
+
+    function displayProducts(products) {
+      let tableBody = document.querySelector("#productTable tbody");
+      tableBody.innerHTML = ""; // Clear previous content
+
+      products.forEach(product => {
+        let row = `
+          <tr>
+            <td>${product.id}</td>
+            <td>${product.name}</td>
+            <td>${product.category}</td>
+            <td>${product.price.toFixed(2)}</td>
+            <td>${product.stock}</td>
+            <td>${product.rating} ⭐</td>
+          </tr>
+        `;
+        tableBody.innerHTML += row;
+      });
+    }
+
+    displayProducts(products);
+
+    let val = document.getElementById("filter");
+    val.addEventListener("change", (e) => {
+      let filterC = e.target.value;
+      if (filterC === "all") {
+        displayProducts(products);
+      }
+      else {
+        let newProducts = products.filter(Element => Element.category === filterC);
+        displayProducts(newProducts);
+      }
+    })
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/12_solve.html b/Video 83/Solutions/12_solve.html
new file mode 100644
index 0000000..8c79585
--- /dev/null
+++ b/Video 83/Solutions/12_solve.html	
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <button class="login">Login</button>
+  <script>
+
+    async function authentication(user) {
+      return new Promise(resolve => {
+        document.querySelector(".login").innerHTML = "Logged In";
+        setTimeout(() => {
+          if (localStorage.getItem('user')) {
+            localStorage.removeItem('user');
+          }
+          resolve("Token expired");
+        }, 5000);
+      })
+    }
+
+    document.querySelector(".login").addEventListener("click", () => {
+      let name = prompt("Enter your username");
+      let pwd = prompt("Enter your password");
+      let user = { name: name, pass: pwd };
+      localStorage.setItem('user', JSON.stringify(user));
+      authentication(user).then(resolve => {
+        document.querySelector(".login").innerHTML = "Login";
+        alert(resolve);
+      })
+    })
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/13_solve.html b/Video 83/Solutions/13_solve.html
new file mode 100644
index 0000000..86c358d
--- /dev/null
+++ b/Video 83/Solutions/13_solve.html	
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <script>
+    let products = [
+      {
+        "id": 1,
+        "name": "Wireless Mouse",
+        "category": "Electronics",
+        "price": 25.99,
+        "stock": 120,
+        "rating": 4.5
+      },
+      {
+        "id": 2,
+        "name": "Mechanical Keyboard",
+        "category": "Electronics",
+        "price": 79.99,
+        "stock": 75,
+        "rating": 4.7
+      },
+      {
+        "id": 3,
+        "name": "Running Shoes",
+        "category": "Footwear",
+        "price": 59.99,
+        "stock": 200,
+        "rating": 4.3
+      },
+      {
+        "id": 4,
+        "name": "Smart Watch",
+        "category": "Wearable Tech",
+        "price": 149.99,
+        "stock": 50,
+        "rating": 4.6
+      },
+      {
+        "id": 5,
+        "name": "Backpack",
+        "category": "Accessories",
+        "price": 39.99,
+        "stock": 180,
+        "rating": 4.2
+      }
+    ]
+
+    function calculateTotal(products) {
+      let initial = 0;
+      return products.reduce((acc, val) => val.price * val.stock + acc, initial);
+    }
+
+    console.log(parseFloat(calculateTotal(products).toFixed(2)));
+  </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/Video 83/Solutions/14_solve.html b/Video 83/Solutions/14_solve.html
new file mode 100644
index 0000000..f2a1bf2
--- /dev/null
+++ b/Video 83/Solutions/14_solve.html	
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+  <style>
+    body {
+      background-color: aquamarine;
+      height: 10000px;
+    }
+
+    button {
+      position: fixed;
+      bottom: 10px;
+      right: 10px;
+      padding: 2rem;
+      border: none;
+      border-radius: 1rem;
+    }
+  </style>
+</head>
+
+<body>
+  <button class="btn">Go to top</button>
+  <script>
+    function gotoTop() {
+      window.scrollTo({ top: 0, behavior: 'smooth' });
+    }
+    document.querySelector(".btn").addEventListener("click", () => gotoTop());
+  </script>
+</body>
+
+</html>
\ No newline at end of file