The language

// Your own functions: a block function with a guard, a one-line function, and an argument given by name.
indicator "User functions"
    edition = 1
    display = pane

fn body_share(open_price: float, close_price: float, high_price: float, low_price: float): float
    let range = high_price - low_price
    if range == 0
        return na
    return math.abs(close_price - open_price) / range

fn scaled(x: float, factor: float = 100.0): float = x * factor

plot(scaled(body_share(open, close, high, low)), name = "Body as a percent of the range")
plot(scaled(0.5), name = "Half", color = color.gray)