<h3 id="heading-url">URL</h3>
<p><a href="https://leetcode.com/problems/add-digits/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/add-digits</a></p>
<h3 id="heading-code">Code</h3>
<p><a href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0258/main.fsx" class="autolinkedURL autolinkedURL-url" target="_blank">github.com/syohex/dotnet-study/blob/master/..</a></p>
<pre><code class="lang-fsharp">let rec toDigits n acc =
    if n = 0
    then
        acc
    else
        toDigits (n / 10) ((n % 10) :: acc)

let rec addDigits (n: int) : int =
    let sum = (toDigits n [])|&gt; List.sum
    if sum &lt; 10
    then    
        sum
    else
        addDigits sum
</code></pre>


### URL

https://leetcode.com/problems/add-digits/

### Code

https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0258/main.fsx

```fsharp
let rec toDigits n acc =
    if n = 0
    then
        acc
    else
        toDigits (n / 10) ((n % 10) :: acc)

let rec addDigits (n: int) : int =
    let sum = (toDigits n [])|> List.sum
    if sum < 10
    then    
        sum
    else
        addDigits sum
```

LeetCode 258. Add Digits in F#

URL

Code