Effective Haskell (Pragmatic Bookshelf)
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‘PolyKinds GHC2021’ (page xx, line 12) is a duplicate entry. See last line on page xix.
(Book version P1.0)
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@RebeccaSkinner
Both module statements in the code examples on pp. xvii and xviii in the Introduction (“Following Along with Example Cod...
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@RebeccaSkinner
On page 198, when phantom types are introduced, when listing other changes to the code example at hand, also this necess...
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@RebeccaSkinner
The book seems to be missing an import statement like
λ import HaskellBook.Examples.Introduction.CreatingModules (Name ...
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the (<>) operator would get passed to the function show instead of
the string we get back when we say show 1.
I think it should ...
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Missing out an i in associativity — associatvity.
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@RebeccaSkinner
On p.61 in Chapter 2, the following is described as finding “the sum of the first ten odd numbers”:
λ (foldr (+) 0 . fi...
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Title: Effective Haskell - Kindle Edition
Chapter: 1 Section: Precedence, Operators, and Fixity
In the first expression, ((((((add add)...
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@RebeccaSkinner
Currently, it is:
sumOfUniques n = foldr (add n) (additiveIdentity n) . unique n
It should be:
sumOfUniques n = ...
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@RebeccaSkinner
At the bottom of page 31 when let is added to the example greeting I cannot get the example to work. I’ve tried rechecki...
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‘PolyKinds GHC2021’ (page xx, line 12) is a duplicate entry. See last line on page xix.
(Book version P1.0)
New
Most Active This Year
the (<>) operator would get passed to the function show instead of
the string we get back when we say show 1.
I think it should ...
New
@RebeccaSkinner
On page 198, when phantom types are introduced, when listing other changes to the code example at hand, also this necess...
New
@RebeccaSkinner
Both module statements in the code examples on pp. xvii and xviii in the Introduction (“Following Along with Example Cod...
New
@RebeccaSkinner
The book seems to be missing an import statement like
λ import HaskellBook.Examples.Introduction.CreatingModules (Name ...
New
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Author Spotlight
Rebecca Skinner
@RebeccaSkinner
Welcome to our latest author spotlight, where we sit down with Rebecca Skinner, auth...
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@RebeccaSkinner
Thanks you for this beautiful book.
Chapter 8 - p.317 3rd paragraph from the bottom
If you build your application and ...
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In toCsv (ePub p 157, dropLeadingComma will leave a leading space. In the case statement, the first case is ‘,’:s’ → s’ and it should be ...
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@RebeccaSkinner,
page 141. calculator.
I suggest you explain a little more about why you introduced the Left and Right types in the Cal...
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@RebeccaSkinner
In Effective Haskell Chapter 11 (~ p 410 in ePub), when creating the Encode and Decode instances for String, pack and un...
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@RebeccaSkinner,
Allright, so I have put all of the example code for Calculator in chapter 4 on page ~140 in a file and when loading it ...
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@RebeccaSkinner
In beta 9.0
A small typo near the bottom of p83:
“but it there are some extra moving parts”
Probably"it" should be dr...
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Hi @RebeccaSkinner,
In for example the Calculator segment of chapter 4, if I run the examples in GHCI this error is returned:
λ: Ad...
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Please use the following format for the title of this thread (then simply delete/replace this text with the content for the thread):
Eff...
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@RebeccaSkinner
In the “Creating New Variables” section of Chapter 1, it says that you can’t reassign variables once defined. But new Ha...
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This is just a general note on UI and helping with the book.
pragprog should make it easier for me as user to edit my erratas/suggestion...
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The function I am testing is handleNums on page 68.
It returns this error message:
λ: :reload
[1 of 1] Compiling Main ...
New
Effective Haskell:Chapter 13 (B9 - PDF version) - infinite loop when running the ClassyArchiver code
Refer to pages 508-511
I get an infinite loop when running the original parseArchive function, after adding a variable called "archiveD...
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In the discussion of map on page 58 you present the example:
map ($ 10) [(+1), (*3), (`div` 5)]
This confuses me a lot. You introduces...
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There’s a small typo in ch2 (B9.0), half way through the section Destructuring Values With Pattern Matching in the sentence:
As an exam...
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Most Active Over Three Years
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
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Title: Effective Haskell - Example doesn’t work (page 8)
Middle of page 8 says: "Create a new Main.hs and copy the example below to get ...
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“Much of this {difficult~>difficulty} is due to the complexity inherent in modern systems. ”
“Today, software needs to do more things...
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At the beginning of the Composing Functions subsection in Chapter 1 it says: “You’ve already done this kind of implicit function composit...
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Functions that accept arguments in any order are called “commutative”, not “associative”. Note that this is mentioned twice in the same p...
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At the end of “Depending on Other Files” (ePub p 153), it says “In the next section you’ll learn the basics of Haskell’s syntax and gramm...
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To be more concise and minimize the number of threads, I grouped the suggested corrections into one post.
A few notes on how I structure...
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In Chapter 8, (Viewing Text One Page at a Time), when defining groupsOf, it says we should use a polymorphic type in the type signature, ...
New
The addPeano function switches the arguments in the recursive call. The implementation should be:
addPeano Z b = b
addPeano (S a) b = a...
New
To be more concise and minimize the number of threads, I grouped the suggested corrections into one post.
A few notes on how I structure...
New
In the “Functions as Data Types” section of Chapter 4 (ePub p 113), the takeDigits parser is introduced as “we could take some digits fro...
New
In the “Filtering List Elements” section, the party budget function is first called “foodBudget” and all subsequent reference are “partyB...
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On page 19, the last line of the guard clause code snippet:
| otherwise = “that’s an unfathomalbly big number”
has “unfathomably” missp...
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“You’ll notice that in all of the examples so far, we’ve created lists that only contain numbers” - this is incorrect, one of the first e...
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Title: Effective Haskell - lambda example would help (pages 8-9)
At the bottom of page 8 and the top of page 9 lambdas are described. I ...
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