F# Object Expressions

by Online Tutorials Library July 14, 2022

F# Object Expressions

F# object expression is a special expression. It creates a new instance of anonymous object type which is based on an existing base type, interface, or set of interfaces.

The syntax of Object Expressions in F# language is given below:

  // When typename is a class:  { new typename [type-params]arguments with      member-definitions      [ additional-interface-definitions ]  }  // When typename is not a class:  { new typename [generic-type-args] with      member-definitions      [ additional-interface-definitions ]  }  

F# Object Expression When Type is Class.

In the following example, you can use other predefined and custom class also like System.Object.

  let ex =   {        new System.Exception() with member x.ToString() = “Hello FSharp”    }  printfn “%A” ex  

Output:

Hello FSharp

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F# Object Expressions

F# Object Expressions

F# Object Expression When Type is Class.

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