Next.js Counter with Context - Next-js Typing CST Test

Next.js Counter with Context — Next-js Code

Uses React Context to provide counter and theme globally.

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

const CounterContext = createContext();
export function CounterProvider({ children }) {
  const [count, setCount] = useState(0);
  const [isDark, setIsDark] = useState(false);
  return (
    <CounterContext.Provider value={{ count, setCount, isDark, setIsDark }}>
      {children}
    </CounterContext.Provider>
  );
}

export default function Counter() {
  const { count, setCount, isDark, setIsDark } = useContext(CounterContext);
  return (
    <div className={isDark ? 'dark-theme' : 'light-theme'} style={{ padding: '2rem' }}>
      <h2>Counter: {count}</h2>
      <button onClick={() => setCount(count + 1)}>+</button>
      <button onClick={() => setCount(count - 1)}>-</button>
      <button onClick={() => setCount(0)}>Reset</button>
      <button onClick={() => setIsDark(!isDark)}>Switch Theme</button>
      <style jsx>{`
        .dark-theme { background: #222; color: #eee; min-height: 100vh; }
        .light-theme { background: #fff; color: #000; min-height: 100vh; }
        button { margin: 0 0.5rem; }
      `}</style>
    </div>
  );
}

Next-js Language Guide

Next.js is a powerful React framework for building modern full-stack web applications with features like server-side rendering, static generation, routing, API endpoints, and server components. It emphasizes performance, scalability, and developer experience.

More Next-js Typing Exercises

Practice Other Languages