JavaScript Code Kung Fu: Mastering Modularity with Functions and Classes

jQuery:

• Leverage jQuery for DOM manipulation: While not strictly necessary for modern JavaScript, jQuery provides a concise syntax for interacting with the Document Object Model (DOM), which represents your web page structure. This can simplify common tasks like selecting elements, adding event listeners, and modifying content.

Design Patterns:

• Consider design patterns for complex scenarios: Design patterns offer solutions to common programming problems. While not a silver bullet, they can provide structure and best practices for specific situations. For example, the "Observer pattern" is useful for creating communication channels between different parts of your code.

Additional Tips:

(file: math.js)

function calculateArea(width, height) {
  return width * height;
}

// You can export the function for use in other files
module.exports = calculateArea;

const calculateArea = require('./math'); // Import the function

const width = 10;
const height = 5;

const area = calculateArea(width, height);
console.log("Area:", area);

Using jQuery for DOM manipulation:

(file: my-script.js)

$(document).ready(function() {
  // Select the button element with ID "myButton"
  $("#myButton").click(function() {
    // Change the background color of the body element on button click
    $("body").css("background-color", "lightblue");
  });
});

Simple design pattern - Observer pattern (basic example):

(file: observer.js)

class Subject {
  constructor() {
    this.observers = [];
  }

  subscribe(observer) {
    this.observers.push(observer);
  }

  unsubscribe(observer) {
    this.observers = this.observers.filter(obs => obs !== observer);
  }

  notify(data) {
    this.observers.forEach(observer => observer.update(data));
  }
}

class Observer {
  constructor(name) {
    this.name = name;
  }

  update(data) {
    console.log(`Observer ${this.name} received data: ${data}`);
  }
}

// Usage
const subject = new Subject();
const observer1 = new Observer("Observer 1");
const observer2 = new Observer("Observer 2");

subject.subscribe(observer1);
subject.subscribe(observer2);

subject.notify("Hello from Subject!");

Code Organization Structures:

Alternative to Design Patterns:

• Functional Programming: This paradigm emphasizes functions and data immutability for building modular and composable code. It can be a powerful alternative to traditional object-oriented design patterns for specific situations.