Creating recursive function but getting error when using argument

Question

I'm trying to make a recursive function in F# and am really new in F# and functional programming so this is probably basic stuff.

let rec groupTheResults (htmlNodes : seq<HtmlNode>, resultList: List<HtmlNodeGroup>) :List<HtmlNodeGroup> =
    if Seq.length htmlNodes > 0 then
        let listThing = Seq.take 2 htmlNodes
        []
    else []

If I remove let listThing = Seq.take 2 htmlNodes then the compiler is all happy. Am I doing something illegal or what?

error FS0010: Unexpected keyword 'else' in expression. Expected 'in' or other token. — eble
Is it possible you are mixing tabs and spaces here in a way that's causing the F# compiler to believe that [] is aligned with the if instead of with the let — JaredPar
You get that error with #indent "off" - possibly it is hanging around from somewhere — John Palmer

John Palmer John Palmer · Accepted Answer · 2013-12-18T22:31:36

From some discussion in the comments, that error is generated using

#indent "off"

which disables F#'s whitespace sensitivity. As a result, an in expected after the let ... line.

You need to reload your fsi session (rightclick -> reset interactive session) to clear it. Typing

#indent "on"

might also work

Creating recursive function but getting error when using argument

1 Answers