Effective Haskell (Pragmatic Bookshelf)
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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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Defining Functor for Either Section (p. 270 ff ePub):
The discussion of the kind error seems as thought kinds have not been introduced ...
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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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@RebeccaSkinner
In the section “Wrapping Basic Data Types”, there is the velocity function and gravity (i.e. on earth at sea level) is b...
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Hi Rebecca,
On page 321 you use Left and Right in the function showLeftRight and I think that you should explain explicitly what Left an...
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Hi,
This is the first book that has truly helped to learn Haskell and to develop confidence to write programs in this language. Thanks s...
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@rebeccaskinner
On p.386, we have the final version of directorySummaryWithMetrics.
When running the code, we see the histogram results...
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Hi! It’s me again with another bit of feedback :smile: .
The following diagram helps visualize how Haskell evaluates the chain of thunks...
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Please make a pass through the book,
getting all the code on 1 side, or the other, of page-breaks,
for e-reader people.
I can’t get ki...
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Hi, I got a bit sidetracked, but I now have time to continue with your book, which I am enjoying a lot. You explain the co-recursion in c...
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Most Active Over Three Years
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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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, ...
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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...
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Effective Haskell Chapter 8
getTerminalSize (Epub p 243) used pure in the case statement and return in the definition of tputScreenDime...
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The discussion of why 1 'div' 0 isn’t evaluated in lazyIODemo (ePub p 214) could be expanded. The rationale (don’t want to read an entire...
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In the first complete version of runHCat (ePub p. 201), that reads a file and prints it to the screen, LambdaCase is used. First, the pro...
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It may be too much nitpicking, but you could consider describing the context in which the two language extensions (OverloadedStrings and ...
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The definition of BinaryTree doesn’t allow for an empty tree (the minimum definition is a Leaf with one element) or two elements (next up...
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At the end of the subsection on records, it might be nice to mention the practice of defining a default value for a complex record (e.g.,...
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In the example:
return "4" >>= ioRead
You could consider adding an explanation, like “Remember that return "4" returns an IO Stri...
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In the description of the algorithm for truncateStatus, the third bullet says “If the length of the status line is longer than the displa...
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