DEV Community: Abdul Haseeb

Master React :

Abdul Haseeb — Thu, 25 Sep 2025 09:00:10 +0000

Here Is the Full React tree, remember you don't need to learn everything - learn what's important and what you need.

├── Prerequisites
│ ├── JavaScript Fundamentals
│ │ ├── ES6+ Features (Arrow functions, Destructuring, Modules)
│ │ ├── Promises and Async/Await
│ │ ├── Array Methods (map, filter, reduce)
│ │ └── DOM Manipulation Basics
│ ├── HTML & CSS
│ │ ├── Semantic HTML
│ │ ├── CSS Flexbox and Grid
│ │ └── Responsive Design
│ └── Node.js & npm
│ ├── Package Management
│ └── Basic CLI Commands
│
├── React Fundamentals
│ ├── Introduction to React
│ │ ├── What is React?
│ │ ├── Virtual DOM Concept
│ │ ├── Component-Based Architecture
│ │ └── React vs Vanilla JavaScript
│ ├── Setting Up Development Environment
│ │ ├── Create React App (CRA)
│ │ ├── Vite
│ │ ├── Next.js (for advanced users)
│ │ └── Development Tools Setup
│ ├── JSX (JavaScript XML)
│ │ ├── JSX Syntax
│ │ ├── Embedding Expressions
│ │ ├── JSX vs HTML Differences
│ │ ├── Conditional Rendering in JSX
│ │ └── Lists and Keys
│ ├── Components
│ │ ├── Functional Components
│ │ ├── Class Components (Legacy)
│ │ ├── Component Composition
│ │ ├── Component Naming Conventions
│ │ └── Importing and Exporting Components
│ ├── Props
│ │ ├── Passing Props
│ │ ├── Props Destructuring
│ │ ├── Default Props
│ │ ├── PropTypes (Type Checking)
│ │ └── Children Props
│ └── State Management (Basic)
│ ├── useState Hook
│ ├── State Updates
│ ├── State vs Props
│ └── Lifting State Up
│
├── React Hooks (Essential)
│ ├── useState
│ │ ├── Basic State Management
│ │ ├── State with Objects and Arrays
│ │ ├── Functional State Updates
│ │ └── Multiple State Variables
│ ├── useEffect
│ │ ├── Component Lifecycle with Hooks
│ │ ├── Side Effects
│ │ ├── Dependency Arrays
│ │ ├── Cleanup Functions
│ │ └── useEffect Best Practices
│ ├── useContext
│ │ ├── Context API
│ │ ├── Creating Contexts
│ │ ├── Provider Pattern
│ │ └── Consuming Context
│ ├── useReducer
│ │ ├── Complex State Logic
│ │ ├── Reducer Functions
│ │ ├── Actions and Dispatch
│ │ └── useReducer vs useState
│ ├── useMemo
│ │ ├── Performance Optimization
│ │ ├── Expensive Calculations
│ │ └── Memoization Patterns
│ ├── useCallback
│ │ ├── Function Memoization
│ │ ├── Preventing Unnecessary Re-renders
│ │ └── useCallback vs useMemo
│ ├── useRef
│ │ ├── DOM References
│ │ ├── Mutable Values
│ │ └── Forwarding Refs
│ └── Custom Hooks
│ ├── Creating Custom Hooks
│ ├── Hook Composition
│ ├── Reusable Logic
│ └── Popular Custom Hook Patterns
│
├── Advanced React Concepts
│ ├── Component Patterns
│ │ ├── Higher-Order Components (HOCs)
│ │ ├── Render Props Pattern
│ │ ├── Compound Components
│ │ ├── Controlled vs Uncontrolled Components
│ │ └── Container/Presentational Pattern
│ ├── React.memo and Optimization
│ │ ├── React.memo for Components
│ │ ├── Preventing Unnecessary Re-renders
│ │ ├── Performance Profiling
│ │ └── React DevTools Profiler
│ ├── Error Boundaries
│ │ ├── Error Handling in React
│ │ ├── componentDidCatch
│ │ ├── Error Boundary Components
│ │ └── Graceful Error Recovery
│ ├── Portals
│ │ ├── Rendering Outside Component Tree
│ │ ├── Modal Implementation
│ │ └── ReactDOM.createPortal
│ ├── Fragments
│ │ ├── React.Fragment
│ │ ├── Short Syntax (<></>)
│ │ └── Avoiding Extra DOM Nodes
│ ├── Refs and DOM Access
│ │ ├── useRef Hook
│ │ ├── Callback Refs
│ │ ├── forwardRef
│ │ └── Imperative DOM Manipulation
│ └── Suspense and Lazy Loading
│ ├── React.Suspense
│ ├── React.lazy for Code Splitting
│ ├── Loading States
│ └── Error Boundaries with Suspense
│
├── State Management
│ ├── Local State Management
│ │ ├── useState for Simple State
│ │ ├── useReducer for Complex State
│ │ └── Custom Hooks for State Logic
│ ├── Context API (Global State)
│ │ ├── React Context
│ │ ├── Provider Pattern
│ │ ├── Multiple Contexts
│ │ └── Context Best Practices
│ ├── Third-Party State Management
│ │ ├── Redux
│ │ │ ├── Redux Core Concepts
│ │ │ ├── Actions and Action Creators
│ │ │ ├── Reducers
│ │ │ ├── Store
│ │ │ ├── connect() and useSelector/useDispatch
│ │ │ └── Redux Toolkit (RTK)
│ │ ├── Zustand
│ │ │ ├── Simple State Management
│ │ │ ├── Store Creation
│ │ │ └── Zustand vs Redux
│ │ ├── Recoil
│ │ │ ├── Atoms and Selectors
│ │ │ ├── Recoil State Management
│ │ │ └── Async Data Flow
│ │ └── Jotai
│ │ ├── Atomic State Management
│ │ └── Bottom-up Approach
│ └── Server State Management
│ ├── React Query (TanStack Query)
│ │ ├── Data Fetching
│ │ ├── Caching
│ │ ├── Background Updates
│ │ └── Optimistic Updates
│ ├── SWR
│ │ ├── Data Fetching Library
│ │ ├── Cache Management
│ │ └── Real-time Updates
│ └── Apollo Client (for GraphQL)
│ ├── GraphQL Integration
│ ├── Client-side Caching
│ └── Optimistic UI Updates
│
├── Routing
│ ├── React Router
│ │ ├── BrowserRouter vs HashRouter
│ │ ├── Route Configuration
│ │ ├── Route Parameters
│ │ ├── Query Strings
│ │ ├── Nested Routing
│ │ ├── Protected Routes
│ │ ├── Navigation (Link, NavLink)
│ │ ├── Programmatic Navigation (useNavigate)
│ │ ├── Route Guards
│ │ └── Lazy Loading Routes
│ ├── Next.js Routing (File-based)
│ │ ├── Pages Directory
│ │ ├── Dynamic Routes
│ │ ├── API Routes
│ │ ├── Middleware
│ │ └── App Router (App Directory)
│ └── Alternative Routing Solutions
│ ├── Reach Router (Deprecated)
│ └── Wouter (Lightweight)
│
├── Styling in React
│ ├── CSS Approaches
│ │ ├── Regular CSS
│ │ ├── CSS Modules
│ │ ├── CSS-in-JS
│ │ └── Utility-First CSS
│ ├── Popular Styling Libraries
│ │ ├── Styled-Components
│ │ │ ├── Template Literals
│ │ │ ├── Props-based Styling
│ │ │ ├── Theming
│ │ │ └── Server-Side Rendering
│ │ ├── Emotion
│ │ │ ├── CSS Prop
│ │ │ ├── Styled Components
│ │ │ └── Performance Optimizations
│ │ ├── Tailwind CSS
│ │ │ ├── Utility Classes
│ │ │ ├── Responsive Design
│ │ │ ├── Custom Components
│ │ │ └── JIT Mode
│ │ └── Material-UI (MUI)
│ │ ├── Component Library
│ │ ├── Theming System
│ │ ├── Customization
│ │ └── Design System
│ ├── Component Libraries
│ │ ├── Ant Design
│ │ ├── Chakra UI
│ │ ├── React Bootstrap
│ │ ├── Semantic UI React
│ │ └── Mantine
│ └── Animation Libraries
│ ├── Framer Motion
│ ├── React Spring
│ ├── React Transition Group
│ └── Lottie React
│
├── Forms and Validation
│ ├── Controlled Components
│ │ ├── Input Handling
│ │ ├── Form State Management
│ │ └── Validation Logic
│ ├── Uncontrolled Components
│ │ ├── Ref-based Form Handling
│ │ ├── Default Values
│ │ └── When to Use Uncontrolled
│ ├── Form Libraries
│ │ ├── Formik
│ │ │ ├── Form State Management
│ │ │ ├── Validation Schema
│ │ │ ├── Field Components
│ │ │ └── Form Submission
│ │ ├── React Hook Form
│ │ │ ├── Performance Optimized Forms
│ │ │ ├── Minimal Re-renders
│ │ │ ├── Built-in Validation
│ │ │ └── Integration with UI Libraries
│ │ └── Final Form
│ │ ├── Subscription-based Updates
│ │ └── Plugin Architecture
│ ├── Validation Libraries
│ │ ├── Yup
│ │ ├── Joi
│ │ ├── Zod
│ │ └── Custom Validation Functions
│ └── Advanced Form Patterns
│ ├── Multi-step Forms
│ ├── Dynamic Form Fields
│ ├── File Upload Handling
│ └── Form Persistence
│
├── HTTP Requests and Data Fetching
│ ├── Fetch API
│ │ ├── GET, POST, PUT, DELETE Requests
│ │ ├── Headers and Authentication
│ │ ├── Error Handling
│ │ └── AbortController
│ ├── Axios
│ │ ├── HTTP Client Library
│ │ ├── Interceptors
│ │ ├── Request/Response Transformation
│ │ └── Concurrent Requests
│ ├── Data Fetching Patterns
│ │ ├── useEffect for Data Fetching
│ │ ├── Custom Hooks for API Calls
│ │ ├── Loading and Error States
│ │ └── Race Condition Prevention
│ ├── GraphQL
│ │ ├── Apollo Client
│ │ ├── GraphQL Queries and Mutations
│ │ ├── Caching Strategies
│ │ └── Subscriptions
│ └── Real-time Communication
│ ├── WebSockets
│ ├── Socket.io
│ ├── Server-Sent Events (SSE)
│ └── Real-time UI Updates
│
├── Testing
│ ├── Testing Fundamentals
│ │ ├── Types of Testing
│ │ ├── Test-Driven Development (TDD)
│ │ └── Testing Best Practices
│ ├── Testing Libraries
│ │ ├── Jest
│ │ │ ├── Test Runners and Matchers
│ │ │ ├── Mocking Functions and Modules
│ │ │ ├── Snapshot Testing
│ │ │ └── Coverage Reports
│ │ ├── React Testing Library
│ │ │ ├── Component Testing Philosophy
│ │ │ ├── Queries and Assertions
│ │ │ ├── User Event Simulation
│ │ │ └── Async Testing
│ │ ├── Enzyme (Legacy)
│ │ │ ├── Shallow, Mount, Render
│ │ │ ├── Component Instance Testing
│ │ │ └── Migration to RTL
│ │ └── Cypress
│ │ ├── End-to-End Testing
│ │ ├── Integration Testing
│ │ ├── Visual Testing
│ │ └── API Testing
│ ├── Testing Strategies
│ │ ├── Unit Testing Components
│ │ ├── Integration Testing
│ │ ├── End-to-End Testing
│ │ └── Visual Regression Testing
│ ├── Mocking and Stubbing
│ │ ├── Mock Service Worker (MSW)
│ │ ├── API Mocking
│ │ ├── Module Mocking
│ │ └── Timer Mocking
│ └── Testing Hooks and Context
│ ├── Testing Custom Hooks
│ ├── Testing Context Providers
│ └── Testing Async Operations
│
├── Performance Optimization
│ ├── React Performance Concepts
│ │ ├── Reconciliation Process
│ │ ├── Virtual DOM Efficiency
│ │ └── Component Update Lifecycle
│ ├── Optimization Techniques
│ │ ├── React.memo
│ │ ├── useMemo and useCallback
│ │ ├── Code Splitting
│ │ ├── Lazy Loading
│ │ └── Bundle Optimization
│ ├── Performance Monitoring
│ │ ├── React DevTools Profiler
│ │ ├── Performance API
│ │ ├── Web Vitals
│ │ └── Lighthouse Integration
│ ├── Bundle Analysis
│ │ ├── Webpack Bundle Analyzer
│ │ ├── Tree Shaking
│ │ ├── Dead Code Elimination
│ │ └── Import Optimization
│ ├── Image and Asset Optimization
│ │ ├── Image Lazy Loading
│ │ ├── Next.js Image Component
│ │ ├── WebP and Modern Formats
│ │ └── CDN Integration
│ └── Advanced Optimization
│ ├── Service Workers
│ ├── Web Workers
│ ├── Streaming and Concurrent Features
│ └── Memory Leak Prevention
│
├── Build Tools and Development Environment
│ ├── Create React App (CRA)
│ │ ├── Default Configuration
│ │ ├── Ejecting
│ │ ├── Environment Variables
│ │ └── Custom Scripts
│ ├── Vite
│ │ ├── Fast Development Server
│ │ ├── Hot Module Replacement (HMR)
│ │ ├── Plugin System
│ │ └── Production Builds
│ ├── Webpack
│ │ ├── Module Bundling
│ │ ├── Loaders and Plugins
│ │ ├── Code Splitting
│ │ └── Custom Configuration
│ ├── Babel
│ │ ├── JavaScript Transpilation
│ │ ├── JSX Transformation
│ │ ├── Polyfills
│ │ └── Plugin Configuration
│ ├── ESLint and Prettier
│ │ ├── Code Linting
│ │ ├── Code Formatting
│ │ ├── Custom Rules
│ │ └── IDE Integration
│ └── Development Tools
│ ├── React Developer Tools
│ ├── Redux DevTools
│ ├── VS Code Extensions
│ └── Browser DevTools
│
├── React Ecosystem and Frameworks
│ ├── Next.js
│ │ ├── Server-Side Rendering (SSR)
│ │ ├── Static Site Generation (SSG)
│ │ ├── Incremental Static Regeneration (ISR)
│ │ ├── API Routes
│ │ ├── File-based Routing
│ │ ├── Image Optimization
│ │ ├── Performance Optimizations
│ │ └── Deployment (Vercel)
│ ├── Gatsby
│ │ ├── Static Site Generator
│ │ ├── GraphQL Data Layer
│ │ ├── Plugin Ecosystem
│ │ ├── Image Processing
│ │ └── Progressive Web App Features
│ ├── Remix
│ │ ├── Full-Stack React Framework
│ │ ├── Nested Routing
│ │ ├── Data Loading
│ │ ├── Form Handling
│ │ └── Progressive Enhancement
│ └── React Native
│ ├── Mobile App Development
│ ├── Cross-Platform Development
│ ├── Native Modules
│ ├── Navigation
│ └── Platform-Specific Code
│
├── Advanced React Features
│ ├── Concurrent Features
│ │ ├── Concurrent Mode
│ │ ├── Suspense for Data Fetching
│ │ ├── useTransition
│ │ ├── useDeferredValue
│ │ └── Selective Hydration
│ ├── Server Components (React 18+)
│ │ ├── Server-Side Components
│ │ ├── Zero-Bundle-Size Components
│ │ ├── Streaming
│ │ └── Selective Hydration
│ ├── React 18 Features
│ │ ├── Automatic Batching
│ │ ├── Strict Mode Enhancements
│ │ ├── New Hooks (useId, useSyncExternalStore)
│ │ └── Concurrent Rendering
│ ├── Experimental Features
│ │ ├── React Forget (Auto-memoization)
│ │ ├── React Flight (Server Components)
│ │ └── Offscreen API
│ └── Design Patterns
│ ├── Micro-Frontends with React
│ ├── Module Federation
│ ├── Component Libraries Development
│ └── Design System Implementation
│
├── State Management Advanced
│ ├── Redux Advanced
│ │ ├── Redux Toolkit (RTK)
│ │ ├── RTK Query
│ │ ├── Redux Saga
│ │ ├── Redux Thunk
│ │ ├── Redux Middleware
│ │ ├── Time Travel Debugging
│ │ └── Redux DevTools
│ ├── Context API Advanced
│ │ ├── Multiple Context Providers
│ │ ├── Context Composition
│ │ ├── Context Performance Optimization
│ │ └── Context vs Redux Trade-offs
│ └── State Machine Libraries
│ ├── XState
│ ├── State Charts
│ └── Finite State Machines
│
├── TypeScript with React
│ ├── TypeScript Fundamentals
│ │ ├── Basic Types
│ │ ├── Interfaces and Types
│ │ ├── Generics
│ │ └── Advanced Types
│ ├── React with TypeScript
│ │ ├── Component Props Typing
│ │ ├── State and Event Typing
│ │ ├── Refs and DOM Types
│ │ ├── Context API with TypeScript
│ │ └── Custom Hooks with TypeScript
│ ├── Advanced TypeScript Patterns
│ │ ├── Generic Components
│ │ ├── Conditional Types
│ │ ├── Utility Types
│ │ └── Type Guards
│ └── TypeScript Tooling
│ ├── TSConfig Configuration
│ ├── Type Checking in CI/CD
│ └── Migration Strategies
│
├── Deployment and DevOps
│ ├── Build and Bundle
│ │ ├── Production Builds
│ │ ├── Environment Variables
│ │ ├── Asset Optimization
│ │ └── Bundle Analysis
│ ├── Deployment Platforms
│ │ ├── Vercel
│ │ ├── Netlify
│ │ ├── AWS Amplify
│ │ ├── GitHub Pages
│ │ ├── Heroku
│ │ └── Docker Deployment
│ ├── CI/CD Pipelines
│ │ ├── GitHub Actions
│ │ ├── GitLab CI
│ │ ├── Jenkins
│ │ └── Automated Testing and Deployment
│ ├── Monitoring and Analytics
│ │ ├── Error Tracking (Sentry)
│ │ ├── Performance Monitoring
│ │ ├── User Analytics
│ │ └── A/B Testing
│ └── SEO and Meta Tags
│ ├── React Helmet
│ ├── Next.js Head Component
│ ├── Open Graph Tags
│ └── Search Engine Optimization
│
├── Security
│ ├── Common Security Vulnerabilities
│ │ ├── Cross-Site Scripting (XSS)
│ │ ├── Cross-Site Request Forgery (CSRF)
│ │ ├── Content Security Policy (CSP)
│ │ └── Dependency Vulnerabilities
│ ├── Authentication and Authorization
│ │ ├── JWT Tokens
│ │ ├── OAuth Integration
│ │ ├── Auth0, Firebase Auth
│ │ ├── Role-Based Access Control (RBAC)
│ │ └── Secure Route Protection
│ ├── Data Security
│ │ ├── Input Sanitization
│ │ ├── HTTPS Implementation
│ │ ├── Secure Headers
│ │ └── Data Encryption
│ └── Security Best Practices
│ ├── Environment Variables
│ ├── API Security
│ ├── Third-Party Library Auditing
│ └── Security Testing
│
├── Accessibility (a11y)
│ ├── Accessibility Fundamentals
│ │ ├── WCAG Guidelines
│ │ ├── Semantic HTML
│ │ ├── ARIA Attributes
│ │ └── Keyboard Navigation
│ ├── React Accessibility
│ │ ├── Focus Management
│ │ ├── Screen Reader Support
│ │ ├── Color Contrast
│ │ └── Alternative Text
│ ├── Accessibility Testing
│ │ ├── axe-core Integration
│ │ ├── Lighthouse Accessibility Audit
│ │ ├── Manual Testing
│ │ └── Screen Reader Testing
│ └── Accessibility Libraries
│ ├── React-aria
│ ├── Reach UI
│ └── Accessibility Testing Tools
│
├── Internationalization (i18n)
│ ├── React i18n Libraries
│ │ ├── react-i18next
│ │ ├── React Intl
│ │ └── FormatJS
│ ├── Implementation Strategies
│ │ ├── Translation Key Management
│ │ ├── Language Detection
│ │ ├── Dynamic Language Switching
│ │ └── Pluralization Rules
│ ├── Advanced i18n Features
│ │ ├── Right-to-Left (RTL) Support
│ │ ├── Number and Date Formatting
│ │ ├── Currency Formatting
│ │ └── Time Zone Handling
│ └── i18n Best Practices
│ ├── Translation Workflow
│ ├── Content Management
│ └── Performance Optimization
│
└── Best Practices and Advanced Topics
├── Code Organization
│ ├── Folder Structure
│ ├── Component Architecture
│ ├── Custom Hooks Organization
│ └── Barrel Exports
├── Design Patterns
│ ├── Container/Presentation Pattern
│ ├── Higher-Order Components (HOCs)
│ ├── Render Props
│ ├── Compound Components
│ └── State Reducer Pattern
├── Performance Best Practices
│ ├── Component Optimization
│ ├── Bundle Size Optimization
│ ├── Runtime Performance
│ └── Memory Management
├── Development Workflow
│ ├── Git Workflow
│ ├── Code Reviews
│ ├── Documentation
│ └── Team Collaboration
├── Debugging and Troubleshooting
│ ├── React DevTools
│ ├── Error Boundaries
│ ├── Performance Debugging
│ └── Common Issues and Solutions
├── Migration and Upgrades
│ ├── React Version Upgrades
│ ├── Legacy Code Migration
│ ├── Third-Party Library Updates
│ └── Breaking Changes Handling
└── Community and Learning Resources
├── Official Documentation
├── Community Forums and Discord
├── Conferences and Meetups
├── YouTube Channels and Courses
├── Blogs and Newsletters
└── Open Source Contribution

Learning Path Recommendations:

Beginner Level (2-3 months):

Prerequisites + React Fundamentals + Basic Hooks + Styling
Focus on: Components, Props, State, useState, useEffect, CSS/CSS Modules

Intermediate Level (3-4 months):

Advanced Hooks + State Management + Routing + Forms + HTTP Requests
Focus on: Custom hooks, Context API, React Router, form handling

Advanced Level (4-6 months):

Performance Optimization + Testing + TypeScript + Build Tools + Frameworks
Focus on: Next.js, optimization techniques, comprehensive testing

Expert Level (Ongoing):

Advanced React features + Security + Accessibility + Best Practices
Focus on: Concurrent features, architecture patterns, team leadership

Remember: Build projects at each level to solidify your understanding. Start with simple components, then progress to full applications!

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Python Project for Data Science
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Exploratory Data Analysis for Machine Learning
https://lnkd.in/gSGx_SVE
Introduction to Data Science Specialization
https://lnkd.in/g-VEMct4
Excel Basics for Data Analysis
https://lnkd.in/gpWNE73C
Fundamentals of Scalable Data Science
https://lnkd.in/ghade8G8
Introduction to Data Analytics
https://lnkd.in/gcxWBZG4
IBM Data Analyst Professional Certificate
https://lnkd.in/g6Dz84eR
Applied Data Science Capstone
https://lnkd.in/grFky2D4
Introduction to Artificial Intelligence (AI)
https://lnkd.in/ghbVVMHT
Introduction to Cybersecurity Tools & Cyber Attacks
https://lnkd.in/gGv6-GKD
IBM Cybersecurity Analyst Professional Certificate
https://lnkd.in/gh4NNgu8

Happy Learning!!!

Hoisting in JavaScript: Most Asked Topic in JOb Interviews

Abdul Haseeb — Fri, 19 Jan 2024 18:07:36 +0000

no trash talking let's get straight in

look at this example:

see function is called before it is declared,
but JavaScript automatically puts the declaration at the top of the script this is called hoisting it is simple:

remember that only declaration will be hoisted not the initialization.

var myVariable will be hoisted and it contains the value undefined after assignment it contains the value 42
so here "var myVariable" is hoisted nut "= 42" is not.

here when we declare the function using var you can see that calling sayHello() before intialization throws an error because intialization is not hoisted "Var sayHello" existed but we did'nt assigned a function to it as initialization is not hoisted so it throws an error.

JavaScript Promises Easiest Explanation Ever:

Abdul Haseeb — Thu, 18 Jan 2024 09:46:01 +0000

Overview

Note: Give it a full read; you might be confused at the beginning, but once you read the whole thing, your doubts will be clear.

Imagine you went to a restaurant and gave an order for food. In return, a waiter gives you a note that says, "We are preparing your order. Once it is ready, I'll let you know." Simple, right?

A promise in coding is similar; it has three states:

Pending: The operation is still ongoing.
Fulfilled: The operation is successful, and the promise is kept.
Rejected: Something went wrong, and the promise is not fulfilled.
So, how does this work in coding? Why do we need promises?

Let's say you want to fetch data from a server. If it takes time, like 10 seconds or more, your program will freeze, right? That's where promises come in. A promise in JavaScript is an object with .then() and .catch() methods. These methods allow us to handle future events, like the waiter telling you your food is ready or apologizing for a kitchen mishap.

Consider the fetchData() function as an example. If it gets back data, it uses .then() to process the data. If there's an error, it uses .catch() to handle it.

Now, you might wonder what your code does in the meantime. The data fetching process runs in the background. For example, after the promise for fetching data, you can call the function add(2, 3), and it will execute without freezing your program.

you got the overview
let's understand all aspects of it deeply...

Introduction to Promises:

A promise is an object in JavaScript that represents the eventual completion or failure of an asynchronous operation. It is a way to handle asynchronous code more elegantly, providing a cleaner and more readable structure compared to traditional callback functions.

States of a Promise:

A promise can exist in one of three states:

Pending: The initial state; the asynchronous operation is ongoing, and the promise is waiting for completion or failure.
Fulfilled: The asynchronous operation completed successfully, and the promise has a resulting value.
Rejected: An error occurred during the asynchronous operation, and the promise is not fulfilled. It contains the reason for failure.

Creating a Promise:

You create a promise using the Promise constructor, which takes a function as an argument. This function, often referred to as the "executor," takes two parameters: resolve and reject.

Using resolve and reject:

resolve(result): Call this function when the asynchronous operation is successful. It transitions the promise to the fulfilled state and passes the result to any attached .then() block.

reject(reason): Call this function if an error occurs during the asynchronous operation. It transitions the promise to the rejected state and passes the reason for failure to any attached .catch() block.

Chaining .then() and .catch():
Use the .then() method to handle the successful completion of a promise and the .catch() method to handle errors in the promise chain. You can chain multiple .then() methods to perform sequential operations.

As a beginner if you understand this much i think you can start using them don't dive too deep into the things which you don't need...leave it as a Blackbox

For example Math.random generates a random number between 0 and 1 so that is enough for you to use it...you don't need to know how things work under the hood at least as a beginner!

Good LUck and Happy Coding!

Information Overload and Chasing the trends Can Ruin Your Life:

Abdul Haseeb — Wed, 17 Jan 2024 07:11:47 +0000

Information Overload and Chasing the trends Can Ruin Your Life:

Zayn and Dawood, were good friends they went to same school lived in the same neighbour hood in a metropolitan city, and when the time came they went to the same college.

Both of them were amazed by the tech and always enjoyed coding they had a dream to get a six-figure job and an enjoyable life,
it was early days of 2023 and an AI Chatbot called ChatGPT has launched few months ago and everybody was talking about AI, it Was on the boom!

Dawood and Zayn were pursuing Computer Science degree at a prestigious university.
One day Elon Musk, who himself started as a programmer(and sold his first company for $300 million and now pioneering other industries),visited their college.
Luckily Zayn and Dawood got the chance to meet him and asked for an advise.
Elon told them to expand their knowledge landscape and try to be useful for others and try to make a positive impact.

Days and months passed until one day...

Dawood encounters alarming online predictions by youtubers and Social media Gurus that programmers won't exist in next 5 - 10 years,
after going through a lot of biased information based on lies had left dawood doubting his career choice he had a lot of questions and he was really confused and tensed....
it was fine until he started believing the rumors without any research...
Dawood kept telling Zayn that they are on wrong track and it's a coding is a dead end...

Zain, unaffected by the noise, remains focused on skill-building and sets clear goals and kept working hard with the clear direction.

Zain applied what elon told him,and he put his efforts into learning, building skills, and sharing his journey online.

Dawood succumbs to the fear, quits college, and opts for shortcut courses with 0 value made by some random youtubers and gurus and started blindly following them and believing their claims of getting a job a very high paying job in Ai in just 3 months...

Fast forward to 5 Years Later...
Zain emerges as a CS graduate with an impressive portfolio, online presence, and $240k offer from a FAANG company.

Dawood, chasing shortcuts and lacking a strategic approach, struggles in his career and can't even find a job,
Severe stress and depression leads to Health issues and he start finding ways to escape the reality.

On the other hand zayn gets a good and comfortable life while doing what he loves to do...

Note :

Dawood and zayn are fictional characters i used to explain my point to not to fell for these pitfalls...

Now i want to ask you Who you want to be Is it Dawood or Zayn?
(comment)

Lessons Learned:

Stick to one thing,

And Avoid Information Overload no matter what,

overcome hype,

and believe in yourself.

Zain's succeeded because he was consistent and he has perseverance.

Beware of shortcuts; they may promise quick gains but often lead to long-term struggles.

The tech industry's demand for skilled programmers remains high, but success requires dedication, not shortcuts

Always Remember this "Programmers ain't going extinct. The world craves your magic. Just put in the work."

Good Luck and Happy Coding!

Master Full-Stack

Abdul Haseeb — Tue, 16 Jan 2024 19:13:46 +0000

Comprehensive:

├─ HTML
├─CSS
├─Tiny Project
├── Git and GitHub
├── Tailwind CSS
├── Project
├── JavaScript
├─ DOM
├─-React/Angular/Vue/Svelte
├── API
├── Node.js
├── Database
└Full-stack Project

Detailed:

├── HTML
│ └── HTML5 semantics
│ └── Forms and input elements
│ └── Multimedia elements (audio, video)
│ └── Accessibility (ARIA roles)
│
├── CSS
│ └── CSS3 features (flexbox, grid)
│ └── Responsive design
│ └── CSS preprocessors (e.g., SASS, LESS)
│ └── CSS frameworks (e.g., Bootstrap)
│
├── Tiny Project
│ └── Git and GitHub
│ └── Basic commands (clone, commit, push, pull)
│ └── Branching strategies (feature branches, release branches)
│ └── Merging and resolving conflicts
│ └── GitHub collaboration (forks, pull requests)
│
├── Tailwind CSS
│ └── Tailwind utility classes
│ └── Customizing and extending Tailwind styles
│ └── Responsive design with Tailwind
│ └── Extracting and optimizing CSS with PurgeCSS
│
├── Project
│ └── JavaScript
│ └── ES6+ features (arrow functions, destructuring, async/await)
│ └── Closures and the 'this' keyword
│ └── Prototypes and inheritance
│ └── Design patterns (e.g., module pattern)
│
│ └── DOM Manipulation
│ └── Selecting and modifying DOM elements
│ └── Event propagation and delegation
│ └── AJAX and Fetch API
│ └── WebSockets for real-time communication
│
│ └── React/Angular/Vue/Svelte
│ └── Advanced state management (Redux, Vuex, etc.)
│ └── Routing and navigation in a single-page application
│ └── Component lifecycle and hooks
│ └── Stateful vs Stateless components
│ └── Testing components (unit and integration tests)
│
│ └── API
│ └── Authentication methods (JWT, OAuth)
│ └── GraphQL fundamentals
│ └── API security best practices
│ └── Handling webhooks
│ └── GraphQL vs REST
│
│ └── Node.js
│ └── Filesystem and streams
│ └── Middleware development
│ └── Asynchronous programming with callbacks and promises
│ └── WebSocket servers with Node.js
│ └── Express.js middleware and routing
│
├── Database
│ └── Relational databases
│ └── Database normalization
│ └── SQL joins and subqueries
│ └── Indexing and optimization
│ └── Transactions and concurrency control
│
│ └── NoSQL databases
│ └── Data modeling in NoSQL databases
│ └── MongoDB aggregation pipeline
│ └── Indexing and sharding
│ └── CAP theorem
│
└── Full-stack Project
└── Integration testing (e.g., Jest, Mocha)
└── User authentication and authorization flows
└── OAuth integration for third-party authentication
└── Deploying applications to cloud platforms (AWS, GCP, Azure)
└── Containerization (Docker)
└── Building RESTful APIs
└── Real-time features with WebSockets
└── Web security (SSL/TLS, HTTPS)
└── Performance monitoring and optimization
└── Logging and error tracking
└── CI/CD pipelines with tools like Jenkins or GitHub Actions

13 GitHub Repos to make your first contribution (JavaScript):

Abdul Haseeb — Tue, 16 Jan 2024 13:42:12 +0000

1.altair (label:good-first-issue)
2.Ancient Beast (label: easy)
3.appsmith (label: good-first-issue)
4.AVA (label: good-for-beginner)
5.Babel (label: good-first-issue)
6.Binari (label: up-for-grabs)
7.Botpress (label: contributor-friendly)
8.Brave Browser (label: good-first-issue)
9.cdnjs (label: good-first-issue)
10.Check It Out (label: good-first-issue)
11.Create React App (label: good-first-issue)
12.cypress (label: good first issue)
13.electron (label: good-first-issue)

Master JavaScript:

Abdul Haseeb — Mon, 15 Jan 2024 07:49:02 +0000

Here Is the Full JavaScript tree, remeber you don't need to learn everything learn what's important and what you need.

├── Basics
│ ├── Variables and Data Types
│ ├── Operators
│ ├── Control Flow (if, else, switch)
│ ├── Loops (for, while, do-while)
│ ├── Functions
│ └── Arrays and Objects
│
├── Advanced Functions
│ ├── Closures
│ ├── Callbacks
│ ├── Promises
│ ├── Async/Await
│ └── Higher-Order Functions
│
├── ES6+ Features
│ ├── Arrow Functions
│ ├── Template Literals
│ ├── Destructuring
│ ├── Rest and Spread Operators
│ ├── Let and Const
│ ├── Classes and Inheritance
│ └── Modules (import/export)
│
├── Object-Oriented Programming (OOP)
│ ├── Objects
│ │ ├── Properties
│ │ └── Methods
│ ├── Constructors
│ │ ├── Constructor Functions
│ │ └── new Keyword
│ ├── Prototypes
│ │ ├── Prototype Chain
│ │ └── Object.create()
│ ├── ES6 Classes
│ │ ├── Class Syntax
│ │ ├── Constructors in Classes
│ │ ├── Methods in Classes
│ │ └── Inheritance with extends
│ ├── Encapsulation
│ │ ├── Closures
│ │ └── Private Variables and Methods
│ ├── Abstraction
│ ├── Polymorphism
│ │ ├── Method Overriding
│ │ └── Method Overloading (JavaScript doesn't support true method overloading)
│ └── Inheritance
│ ├── Single Inheritance
│ └── Multiple Inheritance (JavaScript uses prototype chain for inheritance)
│
├── Scope and Closures
│
├── This Keyword
│
├── Prototype Chain
│
├── Asynchronous JavaScript
│ ├── Callbacks
│ ├── Promises
│ ├── Async/Await
│ └── Event Loop
│
├── Browser Environment
│ ├── DOM Manipulation
│ ├── Events
│ ├── AJAX and Fetch
│ └── Local Storage
│
├── Error Handling
│ ├── try/catch
│ ├── Error Object
│ └── Custom Errors
│
├── Regular Expressions
│
├── Debugging and Dev Tools
│
├── JavaScript Engines
│
├── Memory Management
│ ├── Garbage Collection
│ └── Memory Leaks
│
├── APIs and HTTP
│ ├── RESTful APIs
│ ├── JSON
│ └── AJAX and Fetch
│
├── Testing
│ ├── Unit Testing
│ ├── Integration Testing
│ └── Test Frameworks (e.g., Jest)
│
├── Build Tools and Module Bundlers
│ ├── Webpack
│ ├── Babel
│ └── npm/yarn
│
├── Frontend Frameworks
│ ├── React
│ ├── Angular
│ └── Vue
│
├── Backend Development with Node.js
│ ├── Express.js
│ ├── npm
│ ├── RESTful APIs
│ └── Authentication and Authorization
│
├── Security
│ ├── HTTPS
│ ├── Cross-Site Scripting (XSS)
│ └── Cross-Site Request Forgery (CSRF)
│
├── Design Patterns
│
├── Functional Programming
│ ├── Pure Functions
│ ├── Immutability
│ ├── First-Class Functions
│ ├── Higher-Order Functions
│ └── Recursion
│
├── Data Structures
│ ├── Arrays
│ ├── Linked Lists
│ ├── Stacks
│ ├── Queues
│ ├── Trees
│ ├── Graphs
│ └── Hash Tables
│
├── Algorithms
│ ├── Sorting
│ ├── Searching
│ ├── Recursion
│ └── Dynamic Programming
│
├── WebSockets
│
├── Progressive Web Apps (PWAs)
│
├── Mobile App Development (React Native)
│
├── WebAssembly (Wasm)
│
├── Machine Learning and JavaScript (TensorFlow.js)
│
└── Miscellaneous
├── Code Style and Best Practices
├── Code Version Control (e.g., Git)
├── Code Review
└── Continuous Integration/Continuous Deployment (CI/CD)

FOllow me On Twitter @dev_abdulhaseeb