Code Sandbox

Write and run code in the browser. Supports JavaScript, Python (via Pyodide), and HTML/CSS/JS.

Code Editor

// Hello World in JavaScript
console.log("Hello, World!");

// Variables and loops
const subjects = ["Maths", "Science", "English", "History"];
subjects.forEach((subject, i) => {
  console.log(`${i + 1}. ${subject}`);
});

// A simple function
function fibonacci(n) {
  if (n <= 1) return n;
  let a = 0, b = 1;
  for (let i = 2; i <= n; i++) {
    [a, b] = [b, a + b];
  }
  return b;
}

console.log("\nFirst 10 Fibonacci numbers:");
for (let i = 0; i < 10; i++) {
  console.log(`  F(${i}) = ${fibonacci(i)}`);
}

Output

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