Databases
StackOverflow2013
Postsdbo
PORound-up of Scalaz type class instances for other libraries
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PORound-up of Scalaz type class instances for other libraries
    primarykey
    data
    text
    <p>I often find myself wanting (and then usually writing) <a href="http://code.google.com/p/scalaz/" rel="nofollow noreferrer">Scalaz</a> type class instances for classes in other Scala or Java libraries. To give just a few examples:</p> <p>A monoid instance for <a href="https://github.com/milessabin/shapeless" rel="nofollow noreferrer">Shapeless</a>'s <code>HList</code> gives you <a href="https://stackoverflow.com/a/11439044/334519">monoid instances for case classes with appropriately typed members</a> almost for free.</p> <p>An applicative functor instance for <a href="http://liftweb.net/" rel="nofollow noreferrer">Lift</a>'s <code>Box</code> allows you for example to sequence a list of boxes:</p> <pre><code>scala&gt; val boxen: List[Box[Int]] = Full(1) :: Full(2) :: Full(3) :: Nil boxen: List[net.liftweb.common.Box[Int]] = List(Full(1), Full(2), Full(3)) scala&gt; boxen.sequence res0: net.liftweb.common.Box[List[Int]] = Full(List(1, 2, 3)) </code></pre> <p>A monad instance for <a href="http://dispatch.databinder.net/Dispatch.html" rel="nofollow noreferrer">Dispatch 0.9</a>'s <code>Promise</code> (and <code>Promise[Either[Throwable, _]]</code>, etc.) is hugely useful for all kinds of things.</p> <p>An <a href="https://stackoverflow.com/q/7785762/334519">applicative functor instance</a> for the standard library's <code>Parser</code> makes applicative parsing more concise and elegant. (I just noticed that Scalaz 7 <a href="https://github.com/scalaz/scalaz/blob/scalaz-seven/core/src/main/scala/scalaz/std/util/parsing/combinator/Parser.scala" rel="nofollow noreferrer">now provides a monad instance for <code>Parser</code></a>.)</p> <p>And so on...</p> <p>These instances are almost always very general-purpose, and I'm sure lots of us have written lots of these lots of times. What I'm fishing for with this question is some kind of aggregator or clearinghouse for Scalaz type class instances. I'm not sure such a thing exists—I certainly haven't been able to find anything like it—but even just a collection of links to blog posts, GitHub repositories, or other resources would be useful to me.</p> <p>I'd prefer Scalaz 7 instances, but I'll take anything I can get.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USTravis Brown
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. UStylerweir
      1. VTFavorite
    1. COVote to close because this question could not answered directly. Move it to the Scala mailing lists.
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. USkiritsuku
    2. CO@sschaef: I'll admit I expected that response, and I agree that it's maybe close to the border, but I think it is a practical and answerable question, isn't likely to "solicit extended debate", etc. (Also I've contributed here more than on the Scalaz list, and was hoping to cash in on that.)
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. USTravis Brown
    3. COWouldn't this be more useful as a repository on Github? Then users could collaborate on them and pull them into their own code more easily?
      singulars
      1. PORound-up of Scalaz type class instances for other libraries
      1. USMartin McNulty
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload