Ternary conditional operator in interpolated strings in F#

Question

Is it possible to use the ternary conditional operator in an interpolated string?
Something like:

printfn $"""This is a string{($", and here's the inner string: {innerString}!" if boolFlag  else "!")}\n"""

Answer 1

You can use any valid F# expression when using string interpolation, including the if expression. Just use the standard F# way of writing it if <boo> then <e1> else <e2>:

let boolFlag = true
let innerString = "Yo"

printfn $"""This is a string{
  if boolFlag then $", and here's the inner string: {innerString}!" 
  else "!"}\n"""