how to pass string type list in F# function

Question

This code is giving error FS0001: This expression was expected to have type 'string' but here has type ''a * 'b'

open System 
open System.Linq

let list1 = [ "one"; "two"; "three" ]
let list2 = [ "one"; "two"; "three" ]

let tablesValidation (l1 : string list) (l2 : string list) =
    printfn "%O" l1
    printfn "%O" l2


tablesValidation(list1,list2)
Console.ReadKey() |> ignore

Chad Gilbert · Accepted Answer · 2018-07-09 10:42:31Z

1

In F#, function arguments do not need parentheses and are separated by spaces. Change it to this:

tablesValidation list1 list2

Your original version passed a tuple value as a single parameter, hence the error message, where a * b means a tuple with two fields.

edited Jul 9, 2018 at 10:42

answered Jul 9, 2018 at 10:41

Chad Gilbert

36.4k4 gold badges93 silver badges99 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Akash Vishwakarma Over a year ago

One more question @Chad Gibert what is the alternative of Expect of linq in f# ?

Chad Gilbert Over a year ago

If you're talking about emulating Except in Linq, you may want to try F#'s Seq.filter

Akash Vishwakarma Over a year ago

Yes, exactly I am trying the same :)

Akash Vishwakarma Over a year ago

For example, if I want to apply the same in my above mention code then how could I?

Chad Gilbert Over a year ago

You could define a custom except function like this: let except a b = let set = Set b in Seq.filter (not << set.Contains) a

Collectives™ on Stack Overflow

how to pass string type list in F# function

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related