import React from "react";
import ReactDOM from "react-dom";

class App extends React.Component {
  // react comment
  const test = "test";
  console.log(test);

  render() {
    return <h1>Hello, World!</h1>;
  }
}

# python comment
s = "Python syntax highlighting"
print s

// js comment
var s = "JavaScript syntax highlighting";
alert(s);

// php comment
<?php
echo "Hello World!";
?>