Error FS0001: Expected to have type string, but has type char

0
votes

I am new to programming, and this is my first time working with a .NET language, so I apologise in advance if this question sounds really stupid/trivial.

Here are the relevant snippets of my code:

let isInteger (element: string) =
    let success, result = Int32.TryParse(element)
    if success then Some(result)
    else None
let removeUnnecessaryInfo (someString: string) =
    if isInteger someString.[-1] <> None then
        someString.Remove(-2, 2)
    else 
        someString.Remove(-1, 1)

However, when I try to run it in F# Interactive, I received the following message:

"DuplicateFileFinder.fsx(15,22): error FS0001: This expression was expected to have type string
but here has type char

I.e., "someString.[-1]" is classified as having the type char, which is why isInteger someString.[-1] fails.

Please give me some tips on the changes I can make to get the code to work. Thank you in advance!

1
f#

1 Answers

0
votes

One way change the if to

 if isInteger (someString.[-1] |> string) <> None then