val handled = collisionChecker.getClosetAround(this)?.let { collided ->
    // a lot of stuff happens here, not just simple chained calls
 }

.getClosestAround(this)

Optional<T>

fun getClosetAround(entity: Entity): Collided?

java.lang.Optional<T>

Optional

T?

handled

if (collided != null) {
             // stuff
        } else {
            // other stuff
        }

collided?.let {
  // not null
} ?: run {
 // null
}

if (collided == null)

if (collided?) { stuff } else { other stuff }

== null

collisionChecker.getClosetAround(this)?.let { collided ->
        state.gravityState = GravityState.GROUNDED
        setPosition(position.x, collided.rectangle.y + collided.rectangle.height)
        velocity.y = 0.0f
        state.landTime = System.currentTimeMillis()
    }
            ?: collisionChecker.getOneBelow(this)
            ?: run { state.gravityState = GravityState.FALLING }

?:

if (collided?)

collided: Boolean?

collided = false

method.isAnnotationPresent(NoDefaultView::class.java)

.nil?

isPresent

method.annotations.filter { it.annotationClass == NoDefaultView::class }.firstOrNull()

KAnnotatedElement