StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
19660644
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2013-10-29T14:11:50.167
FavoriteCount
0
LastActivityDate
2013-10-29T14:11:50.167
LastEditDate
LastEditorUserId
0
OwnerUserId
1385860
ParentId
19660232
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
You've very nearly got it. If I attempt to run your code as is, I get: <pre><code>test.hs:2:23: Couldn't match expected type `Char' with actual type `String' Expected type: String Actual type: [String] In the return type of a call of `test' In the first argument of `(:)', namely `(test (afterp d))' </code></pre> So examine line 2: <pre><code>test d = beforep d : (test (afterp d)) : [] -- ^ -- This is the problem -----------------| </code></pre> The type of the cons operator is: <pre><code>(:) :: a -> [a] -> [a] </code></pre> Your <code>test</code> function returns a <code>[String]</code> already, you don't want to try to cons it onto an empty list. That would imply that the return type would be <code>[[String]]</code>. Try this instead: <pre><code>test d = beforep d : (test (afterp d)) </code></pre> After that change, it compiles, but when you run <code>test "i need help"</code> you get the infinite list: <pre><code>["i","need","help","","","","","","","",""... </code></pre> The problem is that you need to include a base case in <code>test</code> that stops when you pass it an empty list. Here's the working code: <pre><code>test :: String -> [String] test [] = [] test d = beforep d : (test (afterp d)) beforep :: String -> String beforep d = takeWhile (/=' ') d afterp :: String -> String afterp d = if (dropWhile (/=' ') d)==[] -- Slightly reformatted then [] -- to improve readability, else tail(dropWhile (/=' ') d) -- no real change. </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POPut string in to list in Haskell
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USNeil Forrester
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POPut string in to list in Haskell
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COThank you very much, great explanation. Exactly what i needed u just made my day ^^
 singulars
 PostPostId
 PO
 UserUserId
 USAndrius

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.