Counter with History - Preact Typing CST Test
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Counter with History — Preact Code
Tracks increment/decrement history.
import { h } from 'preact';
import { useState } from 'preact/hooks';
function HistoryCounter() {
const [count, setCount] = useState(0);
const [history, setHistory] = useState([]);
const increment = () => { setCount(count + 1); setHistory([...history,'Increment']); };
const decrement = () => { setCount(count - 1); setHistory([...history,'Decrement']); };
const reset = () => { setCount(0); setHistory([...history,'Reset']); };
return (
<div>
<h2>Counter: {count}</h2>
<div>History: {history.join(', ')}</div>
<button onClick={increment}>+</button>
<button onClick={decrement}>-</button>
<button onClick={reset}>Reset</button>
</div>
);
}
export default HistoryCounter;Preact Language Guide
Preact is a fast, lightweight JavaScript library for building user interfaces with a React-like API. It emphasizes small bundle size, performance, and compatibility with modern web standards while providing an easy transition for React developers.
Primary Use Cases
- ▸Small to medium web applications
- ▸Mobile-first web apps
- ▸Interactive widgets and components
- ▸Progressive web apps (PWAs)
- ▸High-performance client-side rendering
Notable Features
- ▸Small bundle size (~3KB gzipped)
- ▸React-compatible API
- ▸Fast virtual DOM rendering
- ▸Component-based architecture
- ▸Optional ecosystem add-ons (preact/compat)
Origin & Creator
Created by Jason Miller and first released in 2015, Preact was designed as a lightweight alternative to React for high-performance web applications.
Industrial Note
Preact excels in projects where bundle size, speed, and React compatibility are crucial, such as mobile-first web apps, embedded widgets, and highly interactive UIs.