Question

The example from this post has an example

open System.IO

let lines = 
  File.ReadAllLines("tclscript.do")
  |> Seq.map (fun line ->
      let newLine = line.Replace("{", "{{").Replace("}", "}}")
      newLine )

File.WriteAllLines("tclscript.txt", lines)

that gives an error when compilation.

error FS0001: This expression was expected to have type
    string []    
but here has type
    seq<string> 

How to convert seq to string[] to remove this error message?

Answer 1

Building on Jaime’s answer, since ReadAllLines() returns an array, just use Array.map instead of Seq.map

open System.IO

let lines = 
  File.ReadAllLines("tclscript.do")
  |> Array.map (fun line ->
      let newLine = line.Replace("{", "{{").Replace("}", "}}")
      newLine )

File.WriteAllLines("tclscript.txt", lines)