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Functor typeclass in Haskell models category-theoretic endofunctor rather well.

DON'T start functional programming with monads. Familiarize with currying, pattern matching, how to create data types in Haskell, using recursion instead of loops, higher order fun…

What does the following mean, on http://www.google.cn/landing/cnexp/indexd.html ? 我们已移至 google.com.hk 请收藏我们的新网址

GHC 6.6 is almost 4 years old, please upgrade. ( http://hackage.haskell.org/platform/ )

And it's extremely fast: $ pv /dev/zero > /dev/null 18.6GB 0:00:05 [3.76GB/s] [ ]

Iterators sometimes require restructuring, as in http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html In Haskell they don't - you might write this "producer-consumer" compos…

Under assumption P=NP, a polynomial algorithm is already known (!): http://en.wikipedia.org/wiki/P_%3D_NP_problem#Polynomial-tim... The problem is: will humanity find a feasible al…

I have mixed feelings. http://stackoverflow.com/questions/184118/what-programming-b... http://www.amazon.com/review/R1W0YZZWT53Y9M/ref=cm_cr_rdp_pe...

You'd have to determine if a program halts. Unless you restrict to non-Turing-complete language, this is undecidable.

This answer is also correct in another way :) http://threesixty360.wordpress.com/2008/04/30/1-2-4-8-what-c...

I Was also an Illegal E-Mail Spammer for 5 Years. I got Caught. AMA http://www.reddit.com/r/IAmA/comments/9ebku/

Simple version of B-T in 1D: http://www.math.ucla.edu/~tao/resource/general/121.1.00s/tar...

and $ map can be shortened to all in many places. I'd use pointless style more: row = (!!) The function valid has a lot of repetition, maybe the repeating part can be abstracted of…

Another nice collection: http://www.reddit.com/r/programming/comments/9220o/ask_progg...

http://news.ycombinator.com/item?id=825589