Convert the value in an Option to another type

scala, scala-option

Solution

def myFunc(inVal: Option[Double]): Option[BigDecimal] =
  inVal map {d => d: BigDecimal}

In general if you want to transform value in container (`Option`, `Seq`, `List`, `Try`, `Future`, etc) you should use method `map` on this container.

Method `map` accepts lambda (function) as parameter and applies this function to all elements. `map` should not change the count of elements: `map` on `Some` will never return `None`.

You could use method `BigDecimal.apply` to convert `Double` to `BigDecimal` like this:

BigDecimal(1.1)
// res0: scala.math.BigDecimal = 1.1

But there is also an implicit conversion from `Double` to `BigDecimal`, so you could just specify desired type like this:

1.1: BigDecimal
// res0: scala.math.BigDecimal = 1.1

val bd: BigDecimal = 1.2

PS: type inference allows you to use `d => d` instead of `d => d: BigDecimal` here, but it will make your code very unclear.

Problem

I'm trying to do something that seems like it should have a straight forward syntax/function in scala. I just don't know what that is. I'm trying to convert the contained value of an Option (if it is not None) to another type. Simply I want to know what the code would be if I wanted to implement the following function ``` def myFunc(inVal:Option[Double]):Option[BigDecimal] = { //Code I need goes here } ``` Note: I am not actually implementing this function, it just is the clearest way for me to demonstrate what I need

Original source