F# Casting and Conversions

by Online Tutorials Library July 14, 2022

F# Casting and Conversions

Conversion is a process of converting type of a value to the other required type. It can be primitive or object type.

F# allows casting and conversion of primitive types and object types.

F# Conversion Example

  let x : int = 44                     // integer value  let y : byte = byte x          // conversion integer to byte    printfn “y = %d” y                // byte value    let z : int = int y                // conversion byte into integer  printf “z = %d” z             // integer value  

Output:

y = 44  z = 44

F# Type Casting (Upcasting, and Downcasting) Example

F# allows us to cast object of one type to another type by using :> operator. This operator is used to upcast object. we can downcast object by using :?> operator. We have used these operators in the following program. Let’s see an example.

  type BaseClass() =   class    member this.ShowClassName()=      printfn “BaseClass”   end    type DerivedClass() =    class    inherit BaseClass()    member this.ShowClassName()=     printfn “DerivedClass”   end    let baseClass = new BaseClass()              let derivedClass : DerivedClass = new DerivedClass()  baseClass.ShowClassName()      derivedClass.ShowClassName()  let castIntoBaseClass = derivedClass :> BaseClass        // upcasting   castIntoBaseClass.ShowClassName()  let castIntoDerivedClass = baseClass :?> DerivedClass   // downcasting  castIntoDerivedClass.ShowClassName()  

Output:

BaseClass  DerivedClass  BaseClass

Next TopicF# Operator

F# Casting and Conversions

F# Casting and Conversions

F# Conversion Example

F# Type Casting (Upcasting, and Downcasting) Example

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