Overall Article Outline

• Relearning the Front End — HTML
• Relearning the Front End — CSS
• Relearning the Front End — JavaScript Basics
• Relearning the Front End — JavaScript Object-Oriented Programming
• Relearning the Front End — JavaScript V8 Engine Mechanism
• Relearning the Front End — Browser Rendering Mechanism
• Relearning the Front End — Browser Caching Strategies
• Relearning the Front End — Sorting Algorithms
• Relearning the Front End — Design Patterns
• Relearning the Front End — Networking
• Relearning the Front End — Front-End Security

Section 2.1: Single Responsibility and Open/Closed Principles

The Single Responsibility Principle states that a class should have one responsibility or reason to change, focusing on a single functional area. The Open/Closed Principle suggests that software entities should be open for extension but closed for modification, allowing for flexibility without altering existing code.

Section 2.2: The Singleton Pattern

The Singleton Pattern ensures that a class has only one instance throughout the application lifecycle. This pattern is commonly utilized in scenarios such as state management in Redux or Vuex, where a single instance is necessary for shared resources like shopping carts and user sessions.

Section 2.3: The Factory Pattern

The Factory Pattern encapsulates the object creation logic, akin to a factory producing objects. This pattern is prevalent in large applications, such as jQuery's $ object which acts as a factory method. Other instances include React.createElement() and Vue.component().

Section 2.4: Observer Pattern

The Observer Pattern is widely used in front-end development, where observers listen for changes in an observable object. Once a change occurs, all observers are notified, making it essential for implementing event listening.

This video explains design patterns specifically tailored for front-end developers, illustrating practical applications and benefits.

Section 2.5: Decorator Patterns

The Decorator Pattern allows for dynamic enhancement of a class's functionality. Features like ES7's decorator syntax and React's higher-order components (HoCs) exemplify this pattern. For instance, connect() in react-redux utilizes this approach.

Section 2.6: Adapter Pattern

The Adapter Pattern facilitates compatibility between interfaces that would otherwise not work together. A common real-world analogy is the use of an adapter for mismatched plugs and sockets when traveling.

Section 2.7: Proxy Pattern

The Proxy Pattern involves creating a substitute for an object to control access to the original object. This pattern is often seen in scenarios involving agents, such as talent agencies coordinating access between investors and celebrities.

This video covers five practical design patterns frequently utilized by developers, showcasing their real-world applications.