Nim

Other Nim solutions.
import strformat

proc twoFer*(name = "you"): string =
  &"One for {name}, one for me."

Python

Other Python solutions.
def two_fer(name="you"):
    return f"One for {name}, one for me."

Clojure

Other Clojure solutions.
(ns two-fer)

(defn two-fer
  ([] (two-fer "you"))
  ([name] (format "One for %s, one for me." (or name "you"))))

Elm

Other Elm solutions.
module TwoFer exposing (twoFer)


twoFer : Maybe String -> String
twoFer name =
    "One for " ++ Maybe.withDefault "you" name ++ ", one for me."

Roc

Other Roc solutions.
module [twoFer]

twoFer : [Name Str, Anonymous] -> Str
twoFer = \name ->
    word =
        when name is
            Anonymous -> "you"
            Name n -> n
    "One for $(word), one for me."