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Today's Topics:
1. Re: LYAHFGG, chapter 11 question (Gareth)
2. Re: LYAHFGG, chapter 11 question (Gareth)
3. Re: LYAHFGG, chapter 11 question (Karolis Velicka)
----------------------------------------------------------------------
Message: 1
Date: Fri, 29 Aug 2014 16:00:11 +0100
From: Gareth <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] LYAHFGG, chapter 11 question
Message-ID:
<CANJiHfiBd5gjscN=jgtkov-uesyah-7lp4hyqohpy4k_puk...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Actually, I remember that that chapter being difficult too, so much so that
I don't think I finished it. It might be worth coming back to that chapter
later, after you have more practical experience.
In the mean time though, if I could tell you only one fact about how to use
Applicative, it would be this.
Say you have some pure function:
f :: Int -> Int -> Int -> Int
And some values that may or may not be in the context of some Applicative
functor (let's say Maybe)
x :: Maybe Int
y :: Int
z :: Maybe Int
Then you can call f like this:
(f <$> x <*> pure y <*> z ) :: Maybe Int
So if you were in the middle of some do notation you could
do
myF <- f <$> x <*> pure y <*> z
...
rather than the more painful
do
x' <- x
z' <- z
let myF = f x' y z'
...
On Wed, Aug 27, 2014 at 10:22 AM, Peter Hall <[email protected]> wrote:
> > I learned a new word today, ?Sisyphean.?
>
> Me too! :)
>
> Peter
>
>
> On 27 August 2014 04:21, Jeff C. Britton <[email protected]> wrote:
>
>> I had originally encountered problems at this point myself. I lost
>> motivation because I had just had this feeling that programming with
>> applicatives was just not going to be fun, and it was beginning to seem
>> like Haskell programming might involve a lot of this. I put the book down
>> for about 1 year. Somewhere I came across an article on Monads that
>> changed my mind. I started over and am now almost done with Chapter 13.
>> This time around things are looking a lot cooler. I think chapters 11,12,
>> and 13 may lack the motivational information to keep one going. I can say
>> that the author Miran Lipovaca really does a great job of explaining this
>> material. I don?t think you are going to find a better source. Absolutely
>> every step of the way is laid out in painstaking detail. Plus there are
>> constant reminders of material that was just covered that is relevant to
>> the immediate situation. All I can say is go slow and make sure you
>> understand every detail before proceeding. Keep at it regularly so as not
>> to forget important terms. Go back and reread if necessary. Have the
>> confidence that it will be worthwhile. The Monad chapters are little bit
>> more interesting, but you will need to understand the applicatives first.
>> I learned a new word today, ?Sisyphean.?
>>
>>
>>
>> *From:* Beginners [mailto:[email protected]] *On Behalf Of *
>> Frank
>> *Sent:* Tuesday, August 26, 2014 7:33 PM
>> *To:* The Haskell-Beginners Mailing List - Discussion of primarily
>> beginner-level topics related to Haskell
>> *Subject:* [Haskell-beginners] LYAHFGG, chapter 11 question
>>
>>
>>
>> About "Learn You a Haskell ...", is it My imagination or is chapter 11
>> absurdly long and/or thick? I can (and have) read a 100+ page U.S. Supreme
>> Court ruling, readily understand it, and be able to explain it in plain
>> English, with next to zero trouble. I spend every work day reading,
>> parsing, interpreting, and using, the ISO C++ standard. I *taught* My
>> undergraduate Physics IV class while simultaneously taking it. Yet, chapter
>> 11 feels as if it goes on and on to the point I easily forget what I read
>> just a few lines before, rendering comprehension of the same an almost
>> Sisyphean task. Is it just Me? Am I just tired? Is there an alternative
>> resource for understanding the concepts that particular chapter presents?
>>
>>
>>
>> Sincerely,
>>
>> Frank D. Martinez
>>
>>
>>
>> --
>> P.S.: I prefer to be reached on BitMessage at
>> BM-2D8txNiU7b84d2tgqvJQdgBog6A69oDAx6
>>
>> _______________________________________________
>> Beginners mailing list
>> [email protected]
>> http://www.haskell.org/mailman/listinfo/beginners
>>
>>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://www.haskell.org/mailman/listinfo/beginners
>
>
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Message: 2
Date: Fri, 29 Aug 2014 16:00:12 +0100
From: Gareth <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] LYAHFGG, chapter 11 question
Message-ID:
<CANJiHfjMWLvL=wcmw9wz4eemlin3zxwpkw3eerjemscbmtf...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Actually, I remember that that chapter being difficult too, so much so that
I don't think I finished it. It might be worth coming back to that chapter
later, after you have more practical experience.
In the mean time though, if I could tell you only one fact about how to use
Applicative, it would be this.
Say you have some pure function:
f :: Int -> Int -> Int -> Int
And some values that may or may not be in the context of some Applicative
functor (let's say Maybe)
x :: Maybe Int
y :: Int
z :: Maybe Int
Then you can call f like this:
(f <$> x <*> pure y <*> z ) :: Maybe Int
So if you were in the middle of some do notation you could
do
myF <- f <$> x <*> pure y <*> z
...
rather than the more painful
do
x' <- x
z' <- z
let myF = f x' y z'
...
On Wed, Aug 27, 2014 at 10:22 AM, Peter Hall <[email protected]> wrote:
> > I learned a new word today, ?Sisyphean.?
>
> Me too! :)
>
> Peter
>
>
> On 27 August 2014 04:21, Jeff C. Britton <[email protected]> wrote:
>
>> I had originally encountered problems at this point myself. I lost
>> motivation because I had just had this feeling that programming with
>> applicatives was just not going to be fun, and it was beginning to seem
>> like Haskell programming might involve a lot of this. I put the book down
>> for about 1 year. Somewhere I came across an article on Monads that
>> changed my mind. I started over and am now almost done with Chapter 13.
>> This time around things are looking a lot cooler. I think chapters 11,12,
>> and 13 may lack the motivational information to keep one going. I can say
>> that the author Miran Lipovaca really does a great job of explaining this
>> material. I don?t think you are going to find a better source. Absolutely
>> every step of the way is laid out in painstaking detail. Plus there are
>> constant reminders of material that was just covered that is relevant to
>> the immediate situation. All I can say is go slow and make sure you
>> understand every detail before proceeding. Keep at it regularly so as not
>> to forget important terms. Go back and reread if necessary. Have the
>> confidence that it will be worthwhile. The Monad chapters are little bit
>> more interesting, but you will need to understand the applicatives first.
>> I learned a new word today, ?Sisyphean.?
>>
>>
>>
>> *From:* Beginners [mailto:[email protected]] *On Behalf Of *
>> Frank
>> *Sent:* Tuesday, August 26, 2014 7:33 PM
>> *To:* The Haskell-Beginners Mailing List - Discussion of primarily
>> beginner-level topics related to Haskell
>> *Subject:* [Haskell-beginners] LYAHFGG, chapter 11 question
>>
>>
>>
>> About "Learn You a Haskell ...", is it My imagination or is chapter 11
>> absurdly long and/or thick? I can (and have) read a 100+ page U.S. Supreme
>> Court ruling, readily understand it, and be able to explain it in plain
>> English, with next to zero trouble. I spend every work day reading,
>> parsing, interpreting, and using, the ISO C++ standard. I *taught* My
>> undergraduate Physics IV class while simultaneously taking it. Yet, chapter
>> 11 feels as if it goes on and on to the point I easily forget what I read
>> just a few lines before, rendering comprehension of the same an almost
>> Sisyphean task. Is it just Me? Am I just tired? Is there an alternative
>> resource for understanding the concepts that particular chapter presents?
>>
>>
>>
>> Sincerely,
>>
>> Frank D. Martinez
>>
>>
>>
>> --
>> P.S.: I prefer to be reached on BitMessage at
>> BM-2D8txNiU7b84d2tgqvJQdgBog6A69oDAx6
>>
>> _______________________________________________
>> Beginners mailing list
>> [email protected]
>> http://www.haskell.org/mailman/listinfo/beginners
>>
>>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://www.haskell.org/mailman/listinfo/beginners
>
>
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------------------------------
Message: 3
Date: Fri, 29 Aug 2014 16:38:09 +0100
From: Karolis Velicka <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] LYAHFGG, chapter 11 question
Message-ID:
<CANxL2L5zje-DcVMTMaaK-+Xmi5+NyY4j1TDo=okekeqf5tc...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
I actually found the Typeclassopedia's explanation of functors,
applicatives and monads fairly intuitive, in spite of its intimidating
appearance. You can find it here
http://www.haskell.org/haskellwiki/Typeclassopedia
Best wishes,
Karl (Karolis) Velicka
On 29 August 2014 16:00, Gareth <[email protected]> wrote:
> Actually, I remember that that chapter being difficult too, so much so that
> I don't think I finished it. It might be worth coming back to that chapter
> later, after you have more practical experience.
>
> In the mean time though, if I could tell you only one fact about how to use
> Applicative, it would be this.
>
> Say you have some pure function:
>
> f :: Int -> Int -> Int -> Int
>
> And some values that may or may not be in the context of some Applicative
> functor (let's say Maybe)
>
> x :: Maybe Int
> y :: Int
> z :: Maybe Int
>
> Then you can call f like this:
>
> (f <$> x <*> pure y <*> z ) :: Maybe Int
>
> So if you were in the middle of some do notation you could
>
> do
> myF <- f <$> x <*> pure y <*> z
> ...
>
> rather than the more painful
>
> do
> x' <- x
> z' <- z
> let myF = f x' y z'
> ...
>
>
>
>
>
>
>
> On Wed, Aug 27, 2014 at 10:22 AM, Peter Hall <[email protected]> wrote:
>>
>> > I learned a new word today, ?Sisyphean.?
>>
>> Me too! :)
>>
>> Peter
>>
>>
>> On 27 August 2014 04:21, Jeff C. Britton <[email protected]> wrote:
>>>
>>> I had originally encountered problems at this point myself. I lost
>>> motivation because I had just had this feeling that programming with
>>> applicatives was just not going to be fun, and it was beginning to seem like
>>> Haskell programming might involve a lot of this. I put the book down for
>>> about 1 year. Somewhere I came across an article on Monads that changed my
>>> mind. I started over and am now almost done with Chapter 13. This time
>>> around things are looking a lot cooler. I think chapters 11,12, and 13 may
>>> lack the motivational information to keep one going. I can say that the
>>> author Miran Lipovaca really does a great job of explaining this material.
>>> I don?t think you are going to find a better source. Absolutely every step
>>> of the way is laid out in painstaking detail. Plus there are constant
>>> reminders of material that was just covered that is relevant to the
>>> immediate situation. All I can say is go slow and make sure you understand
>>> every detail before proceeding. Keep at it regularly so as not to forget
>>> important terms. Go back and reread if necessary. Have the confidence that
>>> it will be worthwhile. The Monad chapters are little bit more interesting,
>>> but you will need to understand the applicatives first. I learned a new
>>> word today, ?Sisyphean.?
>>>
>>>
>>>
>>> From: Beginners [mailto:[email protected]] On Behalf Of Frank
>>> Sent: Tuesday, August 26, 2014 7:33 PM
>>> To: The Haskell-Beginners Mailing List - Discussion of primarily
>>> beginner-level topics related to Haskell
>>> Subject: [Haskell-beginners] LYAHFGG, chapter 11 question
>>>
>>>
>>>
>>> About "Learn You a Haskell ...", is it My imagination or is chapter 11
>>> absurdly long and/or thick? I can (and have) read a 100+ page U.S. Supreme
>>> Court ruling, readily understand it, and be able to explain it in plain
>>> English, with next to zero trouble. I spend every work day reading, parsing,
>>> interpreting, and using, the ISO C++ standard. I taught My undergraduate
>>> Physics IV class while simultaneously taking it. Yet, chapter 11 feels as if
>>> it goes on and on to the point I easily forget what I read just a few lines
>>> before, rendering comprehension of the same an almost Sisyphean task. Is it
>>> just Me? Am I just tired? Is there an alternative resource for understanding
>>> the concepts that particular chapter presents?
>>>
>>>
>>>
>>> Sincerely,
>>>
>>> Frank D. Martinez
>>>
>>>
>>>
>>> --
>>> P.S.: I prefer to be reached on BitMessage at
>>> BM-2D8txNiU7b84d2tgqvJQdgBog6A69oDAx6
>>>
>>>
>>> _______________________________________________
>>> Beginners mailing list
>>> [email protected]
>>> http://www.haskell.org/mailman/listinfo/beginners
>>>
>>
>>
>> _______________________________________________
>> Beginners mailing list
>> [email protected]
>> http://www.haskell.org/mailman/listinfo/beginners
>>
>
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://www.haskell.org/mailman/listinfo/beginners
>
------------------------------
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