Option.defaultValue

Two Fer
Two Fer in F# 
let twoFer (nameOpt: string option): string =
    let name = Option.defaultValue "you" nameOpt
    $"One for {name}, one for me."

We use the Option.defaultValue function which either returns the value within the Option<T> value passed to it, or else returns the default value we pass to it ("you").

We then use string interpolation to build the return string where {name} is replaced with the name we just found.

String formatting

The string formatting article discusses alternative ways to format the returned string.

13th May 2025 · Found it useful?

Other Approaches to Two Fer in F#

Other ways our community solved this exercise
let twoFer (nameOpt: string option): string =
    let name =
        match nameOpt with
        | Some name -> name
        | None -> "you"
        
    $"One for {name}, one for me."
Pattern matching

Use pattern matching to get the name to greet.