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let bucket = match n {
    0           => "zero"
    x if x < 0  => "negative"
    1..9        => "small"
    10..99      => "medium"
    _           => "large"
}

match shape {
    Circle(r)  => Console.WriteLine("r={r}")
    Rect(w, h) => Console.WriteLine("rect")
}

let maybe: Greeter? = null
let label = maybe?.Hello()      // null-safe
let name = user?.Name ?? "anon"
guard name != null else {
    return
}

// Comprehension
let squares = [i * i for i in 0..10 if i % 2 == 0]

// Higher-order chain
let total = numbers
    .Filter(n => n > 0)
    .Map(n => n * 2)
    .Reduce(0, (acc, n) => acc + n)

// Pipeline
let shouted = name |> String.ToUpper |> String.Trim

let msg = "Bonjour {user.Name}, tu as {orders.Count()} commandes"

let sql = """
    SELECT id, name
    FROM users
    WHERE created_at > '{since.Format()}'
    ORDER BY name
"""

public enum Result {
    Ok(int)
    Err(string)
}

match compute() {
    Ok(v)    => Console.WriteLine("value: {v}")
    Err(msg) => Console.WriteLine("error: {msg}")
}

public class Box<T> implements IComparable<int> {
    public Value: T

    public int CompareTo(int other) {
        return 0
    }
}

let threshold = 10
let big = xs.Filter(x => x > threshold)

let combine = (a, b) => {
    let sum = a + b
    return sum * 2
}