Embedded Strings in Interpolated Strings in F#

Question

I cannot seem to figure out how I can embed strings inside an interpolated string in F#. Superficially, it is very similar to C#. For example, in C# I would write something like

Console.WriteLine($"Truly, it is {(string.IsNullOrEmpty("") ? "" : "not ")}empty.");

//Result: Truly, it is empty.   OR   Truly, it is not empty.

The parentheses inside the curly brackets allow me to embed additional string literals within the interpolation expression.

I have attempted to replicate this in F# with

printfn $"Truly it is {(match (String.IsNullOrEmpty "l") with | true -> "" | false -> "not ")}empty."

The parentheses wrapping the interpolated expression do not accomplish the same thing, it seems. It suggests using an explicit let binding for the interpolated match expression, but for learning purposes I want to do it in a single line.

Is there a way to do this in F#, or am I stuck defining a let for the embedded ternary?

On a side note: the idiomatic way in F# is to use if then else instead of matching on a boolean. — CaringDev
– CaringDev, Commented Jan 19, 2021 at 6:27

nilekirk · Accepted Answer · 2021-01-19 06:05:46Z

5

Use triple-quoted strings:

printfn $"""Truly it is {match (String.IsNullOrEmpty "l") with | true -> "" | false -> "not "}empty."""

answered Jan 19, 2021 at 6:05

nilekirk

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1 Comment

Travis Over a year ago

Excellent! Thank you!

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