Interactive Code Demo

Run code directly in your browser - no installation required!

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Python

Python Example

# Python runs via Pyodide (WebAssembly) print("Hello from Python!") # Lists and loops numbers = [1, 2, 3, 4, 5] squared = [n ** 2 for n in numbers] print(f"Squared: {squared}") # Dictionary data = {"name": "Alice", "score": 95} for key, value in data.items(): print(f" {key}: {value}")

Loading Python runtime...

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C++

C++ Example

C++

#include <iostream> #include <vector> using namespace std; int main() { cout << "Hello from C++!" << endl; vector<int> nums = {1, 2, 3, 4, 5}; int sum = 0; for (int n : nums) { sum += n; } cout << "Sum: " << sum << endl; return 0; }

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Go

Go Example

Go

package main import "fmt" func main() { fmt.Println("Hello from Go!") // Slice operations nums := []int{1, 2, 3, 4, 5} sum := 0 for _, n := range nums { sum += n } fmt.Printf("Sum: %d\n", sum) }

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Rust

Rust Example

Rust

fn main() { println!("Hello from Rust!"); let numbers = vec![1, 2, 3, 4, 5]; let sum: i32 = numbers.iter().sum(); println!("Sum: {}", sum); // Pattern matching let x = 42; match x { 0 => println!("Zero"), 1..=50 => println!("Small number"), _ => println!("Large number"), } }

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Java

Java Example

Java

public class Main { public static void main(String[] args) { System.out.println("Hello from Java!"); int[] nums = {1, 2, 3, 4, 5}; int sum = 0; for (int n : nums) { sum += n; } System.out.println("Sum: " + sum); } }

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JavaScript

Live Editor

function Counter() {
  const [count, setCount] = React.useState(0);

  return (
    <div style={{ padding: '20px', textAlign: 'center' }}>
      <h3>Count: {count}</h3>
      <button
        onClick={() => setCount(c => c + 1)}
        style={{
          padding: '10px 20px',
          fontSize: '16px',
          cursor: 'pointer'
        }}
      >
        Increment
      </button>
    </div>
  );
}

Result

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Supported Languages

Language	Status	Notes
Python	Local (Pyodide)	Runs in browser via WebAssembly
JavaScript	Local	Live React components
C++	Remote (Judge0 CE)	Free public API
Go	Remote (Judge0 CE)	Free public API
Rust	Remote (Judge0 CE)	Free public API
Java	Remote (Judge0 CE)	Free public API
C#	Remote (Judge0 CE)	Free public API
Ruby	Remote (Judge0 CE)	Free public API
PHP	Remote (Judge0 CE)	Free public API

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How It Works

Language	Execution	Notes
Python	Local (Pyodide)	Runs in browser via WebAssembly - fast!
JavaScript	Local	Live React components
All others	Remote (Judge0 CE)	Free public API, no key needed

All languages work out of the box with no configuration needed!