Expand/Collapse Widget Demo

What is JavaScript?

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JavaScript is a versatile, high-level programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. It enables interactive web pages and is an essential part of web applications.

Key Features:

  • Dynamic typing: Variables can hold values of any type without type declarations
  • First-class functions: Functions are treated as first-class citizens
  • Prototype-based: Object-oriented programming using prototypal inheritance
  • Event-driven: Supports asynchronous programming and event handling

JavaScript runs on the client side of the web, allowing you to create rich interactive experiences without constantly communicating with the server.

CSS Flexbox Basics

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Flexbox is a one-dimensional layout method for arranging items in rows or columns. Items flex to fill additional space or shrink to fit into smaller spaces, making it perfect for responsive design.

Main Concepts:

  • Flex Container: The parent element where display: flex is applied
  • Flex Items: The children of a flex container
  • Main Axis: The primary axis along which flex items are laid out
  • Cross Axis: The axis perpendicular to the main axis

Common Properties:

Container properties include justify-content, align-items, and flex-direction. Item properties include flex-grow, flex-shrink, and align-self.

Web Accessibility (A11y)

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Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can use them. More specifically, people can perceive, understand, navigate, and interact with the Web.

Why It Matters:

  • Inclusivity: Makes content available to everyone, regardless of ability
  • Legal compliance: Many countries have laws requiring digital accessibility
  • Better UX: Accessible design often improves usability for all users
  • SEO benefits: Many accessibility practices align with SEO best practices

WCAG Principles:

The Web Content Accessibility Guidelines are organized around four principles: Perceivable, Operable, Understandable, and Robust (POUR).

RESTful API Design

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REST (Representational State Transfer) is an architectural style for designing networked applications. It relies on a stateless, client-server protocol, almost always HTTP.

Core Principles:

  • Client-Server: Separation of concerns between UI and data storage
  • Stateless: Each request contains all information needed to process it
  • Cacheable: Responses must define themselves as cacheable or not
  • Uniform Interface: Standardized way of communicating between components
  • Layered System: Architecture can be composed of hierarchical layers

HTTP Methods:

RESTful APIs typically use GET (retrieve), POST (create), PUT (update), PATCH (partial update), and DELETE (remove) methods to perform CRUD operations on resources.