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"""

Tomas Petricek · Accepted Answer · 2021-11-28 22:10:54Z

2

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"""

answered Nov 28, 2021 at 22:10

Tomas Petricek

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1 Comment

paolo_ Over a year ago

thanks - it was totally a typo, I could have figure it out myself, sorry about that. (btw the result is not particularly readable, I don't think I'll use it..)

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