state-management

import { create } from 'zustand'
import { persist } from 'zustand/middleware'

interface FilterState {
  search: string
  category: string | null

import SwiftUI

struct ContentView: View {
    @State private var username = ""
    @State private var isLoggedIn = false
    @StateObject private var viewModel = LoginViewModel()

/* Interactive pseudo-classes */
a:link { color: blue; }
a:visited { color: purple; }
a:hover { text-decoration: underline; }
a:active { color: red; }
a:focus { outline: 2px solid orange; }

import React, { createContext, useContext, useState, useEffect, ReactNode } from 'react'
import { User } from '@/types'
import api from '@/services/api'

interface AuthContextType {
  user: User | null

import { useReducer } from 'react'

interface FormState {
  values: Record<string, any>
  errors: Record<string, string>
  touched: Record<string, boolean>

import React from 'react'
import ReactDOM from 'react-dom/client'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
import App from './App'
import './index.css'

# Backend configuration with S3 + DynamoDB locking
terraform {
  backend "s3" {
    bucket         = "company-terraform-state"
    key            = "services/web-app/terraform.tfstate"
    region         = "us-east-1"

import React, { useState, useEffect, useCallback, useMemo, useRef, useContext } from 'react';

// 1. useState - managing component state
function Counter() {
  const [count, setCount] = useState(0);
  const [name, setName] = useState('');

import React, { createContext, useContext, useReducer, useState } from 'react';

// 1. Basic Context
const UserContext = createContext(null);

function UserProvider({ children }) {