[Haskell-cafe] How easy is it to hire Haskell programmers

wren ng thornton wren at freegeek.org
Fri Jul 2 17:16:02 EDT 2010

Andrew Coppin wrote:
> Hmm, interesting. Applicative and Traversable are two classes I've never 
> used and don't really understand the purpose of.

Their main purpose is to avoid the list bias so prevalent from the 
Lispish side of FP. Namely, there are many different kinds of 
collections which can be traversed or folded in ways similar to lists, 
the Foldable and Traversable classes give a common interface for all 
those collections thereby removing the excuse of using lists because 
they have a nicer/more-FP interface than Set, Map, Sequence,...

More abstractly, they capture essential properties of concrete functors 
which represent containers. So for folks who think of functors as (only) 
being containers, these are the methods they expect to have.

> I have no idea what hsc2hs is.

One of the libraries for facilitating bindings between C and Haskell. 
Edward Yang is giving a general discussion[0] of the many libraries for 
C--Haskell binding and how they compare.

> I keep hearing finger trees mentioned, but only in connection 
> to papers that I can't access.

Check out Data.Sequence[1] and Data.FingerTree[2] for canonical 
examples. There's also Edward Kmett's Data.Rope[3] (not to be confused 
with Pierre-Etienne Meunier's Data.Rope[3']). Also, see apfelmus's post 
[4] about finger trees and monoids for a more general perspective.

[0] http://blog.ezyang.com/2010/06/the-haskell-preprocessor-hierarchy/
[1] http://hackage.haskell.org/package/containers
[2] http://hackage.haskell.org/package/fingertree
[3] http://hackage.haskell.org/package/rope
[3'] http://hackage.haskell.org/package/Data-Rope
[4] http://apfelmus.nfshost.com/articles/monoid-fingertree.html

Live well,

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