javascript

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["field"]

  connect() {

.confirm-dialog {
  border: none;
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 26rem;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["parent", "child"]
  static values = {
    options: Object,

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["dialog", "message"]

  connect() {

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('');

// Basic closure example
function outer() {
  const message = 'Hello from outer';

  function inner() {
    console.log(message); // Accesses outer variable

export interface Todo {
  id: string;
  title: string;
  done: boolean;
}

<%= turbo_stream.prepend 'items' do %>
  <%= render @item %>
<% end %>

<turbo-stream action="reset_form" target="new_item_form"></turbo-stream>

// app/javascript/controllers/dropdown_controller.js
import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["menu"]

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["field", "status"]
  static values = {
    key: String,

// 1. DANGEROUS: Never use innerHTML with user input
const userInput = '<img src=x onerror="alert('XSS')">';

// WRONG - vulnerable to XSS
document.getElementById('output').innerHTML = userInput;

// 1. Basic Custom Element
class MyButton extends HTMLElement {
  constructor() {
    super();

    // Attach shadow DOM