like this ``` data class Color(val r: Int, val g:...

# announcements

[cy]

like this

data class Color(val r: Int, val g: Int, val b: Int) {
    init {
        require(r in 0..255) { "invalid red $r" }
        require(g in 0..255) { "invalid green $g" }
        require(b in 0..255) { "invalid blue $b" }
    }
}