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Asked: 2026-05-10T23:51:21+00:00

I want to do something sort of like this: let x = 5 let

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I want to do something sort of like this:

let x = 5 let y = 10  let expr = Console.ReadLine()  expr

Where one might type 'x+y' in the console to store in expr.

How does one evaluate a statement like this in F#?

Ultimately, I want a user to be able to enter expressions, or a set of rules for a system, on a webpage and have them saved in a database to be applied at appropriate times in an F# library. I just don’t know how to convert the entered string in to a function value in F#.

Thanks for any help you may provide!

Adam

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1 Answer

  1. F# doesn’t have eval, as mentioned, but if you can define the grammar, you can utilize the Lex and Yacc implementations in F# (fslex and and fsyacc).

    EDIT:

    As a quick follow up, I know in ocaml you can exploit the interactive console to your users with ocamlmktop. I am unsure of an equivalent in F#. This, although, doesn’t seem to match what you want with a web interface (correct?).

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