<h2 id="heading-url">URL</h2>
<p><a href="https://leetcode.com/problems/detect-capital/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/detect-capital</a></p>
<h2 id="heading-code">Code</h2>
<pre><code class="lang-fsharp">open System

let detectCapitalUse (word: string) : bool =
    let cs = word |&gt; Seq.toList

    match cs with
    | [] -&gt; true
    | c :: tail when Char.IsLower(c) -&gt; tail |&gt; List.forall Char.IsLower
    | _ :: tail -&gt;
        (tail |&gt; List.forall Char.IsLower)
        || (tail |&gt; List.forall Char.IsUpper)

// true
detectCapitalUse "USA"
// true
detectCapitalUse "leetcode"
// true
detectCapitalUse "Google"
// true
detectCapitalUse "USA"
// false
detectCapitalUse "FlaG"
// true
detectCapitalUse "ggg"
// true
detectCapitalUse "g"
// false
detectCapitalUse "FFFFFFFFFFFFFFf"
</code></pre>


## URL

https://leetcode.com/problems/detect-capital/

## Code

```fsharp
open System

let detectCapitalUse (word: string) : bool =
    let cs = word |> Seq.toList

    match cs with
    | [] -> true
    | c :: tail when Char.IsLower(c) -> tail |> List.forall Char.IsLower
    | _ :: tail ->
        (tail |> List.forall Char.IsLower)
        || (tail |> List.forall Char.IsUpper)

// true
detectCapitalUse "USA"
// true
detectCapitalUse "leetcode"
// true
detectCapitalUse "Google"
// true
detectCapitalUse "USA"
// false
detectCapitalUse "FlaG"
// true
detectCapitalUse "ggg"
// true
detectCapitalUse "g"
// false
detectCapitalUse "FFFFFFFFFFFFFFf"
```

LeetCode 0520. Detect Capital in F#

URL

Code