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How to convert String to int(and not to int option) in SML

I am trying to extract integer value from a string using Int.fromString function but as we know, its specification is : String -> int option. So the result of applying Int.fromString is of type int option. But I need the result of type int. Also I am sure that the extracted part is integer. How can this be done?

Solution

  • You are free to use SOME in the left part of expression:

    val SOME x = Int.fromString "3";
val x = 3 : int