StackOverflow2013

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PO
primarykey
Id
10756992
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0
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0
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0
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CreationDate
2012-05-25T15:14:19.903
FavoriteCount
0
LastActivityDate
2015-05-06T00:19:58.733
LastEditDate
2015-05-06T00:19:58.733
LastEditorUserId
113632
OwnerUserId
82609
ParentId
9561295
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
It really looks like the <a href="https://hackage.haskell.org/package/base-4.2.0.1/docs/Data-Maybe.html" rel="nofollow"><code>Maybe</code></a> Monad pattern from Haskell. You should read the following, Wikipedia <a href="http://en.wikipedia.org/wiki/Monad_%28functional_programming%29#Maybe_monad" rel="nofollow">Monad (functional programming)</a>: And read <a href="http://kerflyn.wordpress.com/2011/12/05/from-optional-to-monad-with-guava/" rel="nofollow">From Optional to Monad with Guava</a> on <a href="http://kerflyn.wordpress.com/" rel="nofollow">Kerflyn's Blog,</a> which discusses about the Optional of Guava used as a Monad: <hr> Edit: With Java8, there's a built-in Optional that has monadic operators like <code>flatMap</code>. This has been a controversial subject but finally has been implemented. See <a href="http://www.nurkiewicz.com/2013/08/optional-in-java-8-cheat-sheet.html" rel="nofollow">http://www.nurkiewicz.com/2013/08/optional-in-java-8-cheat-sheet.html</a> <pre><code>public Optional<String> tryFindSimilar(String s) //... Optional<Optional<String>> bad = opt.map(this::tryFindSimilar); Optional<String> similar = opt.flatMap(this::tryFindSimilar); </code></pre> The <code>flatMap</code> operator is essential to allow monadic operations, and permits to easily chain calls that all return Optional results. Think about it, if you used the <code>map</code> operator 5 times you would end up with an <code>Optional<Optional<Optional<Optional<Optional<String>>>>></code>, while using <code>flatMap</code> would give you <code>Optional<String></code> Since Java8 I would rather not use Guava's Optional which is less powerful.
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1. This table or related slice is empty.
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1. POWhat's the point of Guava's Optional class
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1. PTAnswer
UserLastEditorUserId
1. USdimo414
UserOwnerUserId
1. USSebastien Lorber
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1. VO
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