Available on jvm
staticempty():OptionalDouble
staticof(param1:Float):OptionalDouble
equals(param1:Dynamic):Bool
getAsDouble():Float
hashCode():Int
ifPresent(param1:DoubleConsumer):Void
isPresent():Bool
orElse(param1:Float):Float
orElseGet(param1:DoubleSupplier):Float
orElseThrow<X>(param1:Supplier<X>):Float
toString():String