// 一个可以直接运行的示例脚本：
//   monkey posts/monkey/demo.monkey

let square = fn(x) { x * x };

let factorial = fn(n) {
    if (n == 0) { 1 } else { n * factorial(n - 1) }
};

puts(factorial(5));
puts(map([1, 2, 3, 4, 5], square));
puts(fibonacci(10));
sum([1, 2, 3, 4, 5]);