Thank you everyone! I like Haskell because the following two reasons: 1. It is beautifully 2. There are many great guys like you here.
I will work harder on it, and forgive me for my broken English. On Thu, Jan 31, 2013 at 12:41 AM, Rustom Mody <rustompm...@gmail.com> wrote: > > > On Wed, Jan 30, 2013 at 5:32 PM, Junior White <efi...@gmail.com> wrote: > >> >> >> Thanks for your reply! I must learn more to fully understand what's >> going on inside the list comprehension. >> But when I frist learn Haskell, it says sequence doesn't matter, but now >> it is a big matter, can compiler do some thing for us? I think this >> behavior is not friendly to newbies like me, I will take a very long time >> to work through it. >> > > Good point. Being a programmer means having to juggle many hats -- two > important ones being the mathematician-hat and the machine-hat, also called > declaration and 'imperation' Get only the first and your programs will run > very inefficiently. Get only the second and your program will have bugs. > > Specifically in the case of list comprehensions the newbie needs > - to practice thinking of the comprehension like a set comprehension and > ignoring computation sequences > - to practice thinking of comprehension in terms of map/filter etc ie > operationally > > Both views are needed. > Rusi > -- > http://www.the-magus.in > http://blog.languager.org > >
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