Vanilla JS Counter - JavaScript Typing CST Test
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Vanilla JS Counter — JavaScript Code
Simple counter with increment, decrement, and reset functionality.
document.addEventListener('DOMContentLoaded', () => {
const counterEl = document.getElementById('counter');
const incBtn = document.getElementById('increment');
const decBtn = document.getElementById('decrement');
const resetBtn = document.getElementById('reset');
let count = 0;
const updateUI = () => counterEl.textContent = `Counter: ${count}`;
incBtn.addEventListener('click', () => { count++; updateUI(); });
decBtn.addEventListener('click', () => { count--; updateUI(); });
resetBtn.addEventListener('click', () => { count = 0; updateUI(); });
updateUI();
});JavaScript Language Guide
JavaScript is a high-level, interpreted programming language primarily used to create dynamic and interactive content on web pages. It enables client-side scripting, DOM manipulation, and integration with HTML and CSS.
Primary Use Cases
- ▸Adding interactivity to web pages
- ▸Manipulating the DOM and HTML elements dynamically
- ▸Form validation and user input handling
- ▸Creating web applications and single-page applications (SPA)
- ▸Server-side development with Node.js
Notable Features
- ▸Event handling and listeners
- ▸Asynchronous programming with Promises and async/await
- ▸Prototype-based object-oriented programming
- ▸Dynamic typing and flexible syntax
- ▸Extensive ecosystem of libraries and frameworks (React, Angular, Vue)
Origin & Creator
Created by Brendan Eich in 1995 at Netscape Communications.
Industrial Note
JavaScript is specialized for web interactivity, dynamic content updates, and client-side logic, but it is also widely used for server-side applications via Node.js.