Check if string is all upper case

Checks if a string is all in upper-case characters

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open System

let isUpper (str : string) =
    let rec strIter isUpper arr =
        match arr with
        | [] -> isUpper
        | _ -> 
            match Char.IsLower(arr.Head) with
            | true -> strIter false []
            | false -> strIter true arr.Tail

    strIter true (Array.toList <| str.ToCharArray())

namespace System

val isUpper : str:string -> bool

Full name: Script.isUpper

val str : string

Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = String

Full name: Microsoft.FSharp.Core.string

val strIter : (bool -> char list -> bool)

val isUpper : bool

val arr : char list

type Char =
  struct
    member CompareTo : value:obj -> int + 1 overload
    member Equals : obj:obj -> bool + 1 overload
    member GetHashCode : unit -> int
    member GetTypeCode : unit -> TypeCode
    member ToString : unit -> string + 1 overload
    static val MaxValue : char
    static val MinValue : char
    static member ConvertFromUtf32 : utf32:int -> string
    static member ConvertToUtf32 : highSurrogate:char * lowSurrogate:char -> int + 1 overload
    static member GetNumericValue : c:char -> float + 1 overload
    ...
  end

Full name: System.Char

Char.IsLower(c: char) : bool
Char.IsLower(s: string, index: int) : bool

property List.Head: char

property List.Tail: char list

type Array =
  member Clone : unit -> obj
  member CopyTo : array:Array * index:int -> unit + 1 overload
  member GetEnumerator : unit -> IEnumerator
  member GetLength : dimension:int -> int
  member GetLongLength : dimension:int -> int64
  member GetLowerBound : dimension:int -> int
  member GetUpperBound : dimension:int -> int
  member GetValue : [<ParamArray>] indices:int[] -> obj + 7 overloads
  member Initialize : unit -> unit
  member IsFixedSize : bool
  ...

Full name: System.Array

val toList : array:'T [] -> 'T list

Full name: Microsoft.FSharp.Collections.Array.toList

String.ToCharArray() : char []
String.ToCharArray(startIndex: int, length: int) : char []

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More information

Link:	http://fssnip.net/7TK
Posted:	6 years ago
Author:	Martin Lockstrom
Tags:	string , upper case