Constants

const PI = 3.14;
console.log(PI);

package main

// Declare two individual constants. Yes,
// non-ASCII letters can be used in identifiers.
const π = 3.1416
const Pi = π // equivalent to: Pi == 3.1416

// Declare multiple constants in a group.
const (
	No         = !Yes
	Yes        = true
	MaxDegrees = 360
	Unit       = "radian"
)

func main() {
	// Declare multiple constants in one line.
	const TwoPi, HalfPi, Unit2 = π * 2, π * 0.5, "degree"
}

const (
	pi    = 3.14
	world = '世界'
)

println(pi)
println(world)

// Constants are declared with const. They can only be defined at the module level (outside of functions).
// Constant values can never be changed.
// V constants are more flexible than in most languages. You can assign more complex values:
struct Color {
	r int
	g int
	b int
}

pub fn (c Color) str() string { return '{$c.r, $c.g, $c.b}' }

fn rgb(r, g, b int) Color { return Color{r: r, g: g, b: b} }

const (
	numbers = [1, 2, 3]

	red  = Color{r: 255, g: 0, b: 0}
	blue = rgb(0, 0, 255)
)

println(numbers)
println(red)
println(blue)