learning-hub/codes.html at main · 7vikfox/learning-hub · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Programming Notes</title>

  <style>
    /* RESET */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: Arial, sans-serif;
    }

    body {
      background: #0f172a;
      color: #e2e8f0;
      display: flex;
    }

    /* SIDEBAR */
    .sidebar {
      width: 25%;
      background: #1e293b;
      padding: 20px;
      height: 100vh;
      overflow-y: auto;
      border-right: 2px solid #334155;
    }

    .sidebar h2 {
      margin-bottom: 15px;
      color: #38bdf8;
    }

    .sidebar section {
      margin-bottom: 25px;
    }

    .sidebar li {
      margin-bottom: 10px;
      font-size: 14px;
    }

    /* MAIN CONTENT */
    .main {
      width: 75%;
      padding: 30px;
      overflow-y: auto;
      height: 100vh;
    }

    h1 {
      text-align: center;
      margin-bottom: 30px;
      color: #22c55e;
    }

    .card {
      background: #1e293b;
      padding: 20px;
      border-radius: 12px;
      margin-bottom: 25px;
      box-shadow: 0 0 10px rgba(0,0,0,0.5);
    }

    .card h2 {
      color: #facc15;
      margin-bottom: 10px;
    }

    .card ul {
      margin-left: 20px;
    }

    .card li {
      margin-bottom: 10px;
      line-height: 1.6;
    }

    code {
      background: #334155;
      padding: 3px 6px;
      border-radius: 5px;
      color: #38bdf8;
    }
  </style>
</head>

<body>

  <!-- SIDEBAR -->
  <div class="sidebar">

    <h2>Quick Notes</h2>

    <!-- Python -->
    <section>
      <h3>Python</h3>
      <ul>
        <li>Easy & beginner-friendly</li>
        <li>Used in AI, ML, Data Science</li>
        <li>No need to declare data types</li>
        <li>Example: <code>print("Hello")</code></li>
      </ul>
    </section>

    <!-- Go -->
<section>
  <h3>Go (Golang)</h3>

  <ul>

    <!-- ================= BEGINNER ================= -->
    <li><b>Beginner Level:</b>
      <ul>
        <li><b>Definition:</b> Go (Golang) is an open-source programming language developed by Google. It is designed for simplicity, performance, and efficient concurrency.</li>

        <li><b>Key Features:</b>
          <ul>
            <li>Compiled language (fast execution)</li>
            <li>Simple and clean syntax</li>
            <li>Built-in concurrency support</li>
          </ul>
        </li>

        <li><b>Basic Structure:</b>
          <pre><code>
package main

import "fmt"

func main() {
    fmt.Println("Hello World")
}
          </code></pre>
        </li>

        <li><b>Variables:</b>
          <pre><code>
var name string = "Go"
age := 20   // short declaration

fmt.Println(name, age)
          </code></pre>
        </li>

        <li><b>Data Types:</b> int, float64, string, bool</li>
      </ul>
    </li>


    <!-- ================= INTERMEDIATE ================= -->
    <li><b>Intermediate Level:</b>
      <ul>

        <li><b>Functions:</b>
          <pre><code>
func add(a int, b int) int {
    return a + b
}

result := add(5, 3)
fmt.Println(result)
          </code></pre>
        </li>

        <li><b>Arrays & Slices:</b>
          <pre><code>
// Array
var arr [3]int = [3]int{1, 2, 3}

// Slice (dynamic)
slice := []int{1, 2, 3, 4}
slice = append(slice, 5)

fmt.Println(slice)
          </code></pre>
        </li>

        <li><b>Loops:</b>
          <pre><code>
for i := 0; i < 5; i++ {
    fmt.Println(i)
}
          </code></pre>
        </li>

        <li><b>Conditionals:</b>
          <pre><code>
x := 10

if x > 5 {
    fmt.Println("Greater")
} else {
    fmt.Println("Smaller")
}
          </code></pre>
        </li>

      </ul>
    </li>


    <!-- ================= ADVANCED ================= -->
    <li><b>Advanced Level:</b>
      <ul>

        <li><b>Structs (like classes):</b>
          <pre><code>
type Person struct {
    name string
    age  int
}

p := Person{name: "John", age: 25}
fmt.Println(p.name)
          </code></pre>
        </li>

        <li><b>Concurrency (Goroutines):</b>
          <pre><code>
func printMsg() {
    fmt.Println("Hello from Goroutine")
}

go printMsg()

fmt.Println("Main Function")
          </code></pre>
        </li>

        <li><b>Channels:</b>
          <pre><code>
ch := make(chan string)

go func() {
    ch <- "Hello"
}()

msg := <-ch
fmt.Println(msg)
          </code></pre>
        </li>

        <li><b>Error Handling:</b>
          <pre><code>
func divide(a, b int) (int, error) {
    if b == 0 {
        return 0, fmt.Errorf("cannot divide by zero")
    }
    return a / b, nil
}
          </code></pre>
        </li>

      </ul>
    </li>


    <!-- ================= USES ================= -->
    <li><b>Real-World Uses:</b>
      <ul>
        <li>Backend development (APIs, servers)</li>
        <li>Cloud systems (Docker, Kubernetes)</li>
        <li>Microservices architecture</li>
        <li>DevOps tools</li>
      </ul>
    </li>

  </ul>
</section>


    <!-- Ruby -->
    <section>
      <h3>Ruby</h3>
      <ul>
        <li>Simple & readable syntax</li>
        <li>Used in web development</li>
        <li>Popular framework: Rails</li>
        <li>Example: <code>puts "Hello"</code></li>
      </ul>
    </section>

  </div>

  <!-- MAIN CONTENT -->
  <div class="main">
<h1>Programming Language Notes</h1>

<!-- ================= JAVA ================= -->
<div class="card">
  <h2>Java</h2>
  <ul>

    <!-- Beginner -->
    <li><b>Beginner Level:</b>
      <ul>
        <li><b>Definition:</b> Java is a high-level, object-oriented programming language used to build platform-independent applications.</li>
        <li><b>Basic Syntax:</b> Java programs are written inside classes and executed using the main method.</li>
        <li><b>Example:</b> <code>System.out.println("Hello World");</code></li>
        <li><b>Key Concepts:</b> Variables, Data Types (int, float, char), Operators</li>
      </ul>
    </li>

    <!-- Intermediate -->
    <li><b>Intermediate Level:</b>
      <ul>
        <li><b>OOP Concepts:</b> Class, Object, Inheritance, Polymorphism, Encapsulation, Abstraction</li>
        <li><b>Collections Framework:</b> ArrayList, HashMap, HashSet</li>
        <li><b>Exception Handling:</b> try, catch, finally, throw</li>
        <li><b>Multithreading:</b> Running multiple threads simultaneously</li>
      </ul>
    </li>

    <!-- Advanced -->
    <li><b>Advanced Level:</b>
      <ul>
        <li><b>JVM Architecture:</b> ClassLoader, Memory Areas, Execution Engine</li>
        <li><b>Spring Framework:</b> Used for enterprise applications</li>
        <li><b>Hibernate:</b> ORM tool for database interaction</li>
        <li><b>Microservices:</b> Building scalable distributed systems</li>
      </ul>
    </li>

    <li><b>Uses:</b> Android apps, enterprise software, backend systems</li>

  </ul>
</div>

<!-- ================= JAVASCRIPT ================= -->
<div class="card">
  <h2>JavaScript</h2>
  <ul>

    <!-- Beginner -->
    <li><b>Beginner Level:</b>
      <ul>
        <li><b>Definition:</b> JavaScript is a scripting language used to create interactive web pages.</li>
        <li><b>Basic Syntax:</b> Runs inside browser</li>
        <li><b>Example:</b> <code>console.log("Hello World");</code></li>
        <li><b>Core Concepts:</b> Variables (let, const), Functions, Loops</li>
      </ul>
    </li>

    <!-- Intermediate -->
    <li><b>Intermediate Level:</b>
      <ul>
        <li><b>DOM Manipulation:</b> Changing HTML/CSS using JS</li>
        <li><b>Events:</b> onclick, onsubmit, keypress</li>
        <li><b>ES6 Features:</b> Arrow functions, template literals, destructuring</li>
        <li><b>Asynchronous JS:</b> Callbacks, Promises, async/await</li>
      </ul>
    </li>

    <!-- Advanced -->
    <li><b>Advanced Level:</b>
      <ul>
        <li><b>Closures:</b> Functions remembering their scope</li>
        <li><b>Event Loop:</b> Handles async execution</li>
        <li><b>Frameworks:</b> React, Angular, Vue</li>
        <li><b>Backend:</b> Node.js for server-side development</li>
      </ul>
    </li>

    <li><b>Uses:</b> Web apps, APIs, full-stack development</li>

  </ul>
</div>

<!-- ================= PYTHON ================= -->
<div class="card">
  <h2>Python</h2>
  <ul>

    <!-- Beginner -->
    <li><b>Beginner Level:</b>
      <ul>
        <li><b>Definition:</b> Python is a high-level, easy-to-learn programming language.</li>
        <li><b>Syntax:</b> Simple and readable</li>
        <li><b>Example:</b> <code>print("Hello World")</code></li>
        <li><b>Basics:</b> Variables, Lists, Tuples, Dictionaries</li>
      </ul>
    </li>

    <!-- Intermediate -->
    <li><b>Intermediate Level:</b>
      <ul>
        <li><b>Functions:</b> def keyword</li>
        <li><b>OOP:</b> Classes and objects</li>
        <li><b>Modules:</b> Importing libraries</li>
        <li><b>File Handling:</b> Reading and writing files</li>
      </ul>
    </li>

    <!-- Advanced -->
    <li><b>Advanced Level:</b>
      <ul>
        <li><b>Libraries:</b> NumPy, Pandas, Matplotlib</li>
        <li><b>Machine Learning:</b> Scikit-learn, TensorFlow</li>
        <li><b>Web Frameworks:</b> Django, Flask</li>
        <li><b>Automation:</b> Scripts for tasks</li>
      </ul>
    </li>

    <li><b>Uses:</b> AI, data science, automation, web apps</li>

  </ul>
</div>