StackOverflow2013

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plurals

PO
primarykey
Id
7323669
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-09-06T17:20:37.390
FavoriteCount
0
LastActivityDate
2011-09-14T17:34:54.523
LastEditDate
2011-09-14T17:34:54.523
LastEditorUserId
255909
OwnerUserId
255909
ParentId
7322749
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
The answer given by Kevin Wright is entirely correct, but to break it down further: The first line is declaring a function called <code>foo</code>. <code>foo</code> takes as its argument another function, <code>bar</code> that itself takes in <code>Unit</code> and returns a <code>String</code>. Generally speaking, <code>Unit</code> in scala has the same meaning that <code>void</code> does in many other languages, so you could say for the most part that <code>bar</code> is a function that takes in no arguments and returns a <code>String</code>. The body of the <code>foo</code> function simply returns the argument it received. Therefore, scala infers that <code>foo</code> returns a function that takes <code>Unit</code> and returns a <code>String</code>. The second command calls <code>foo</code> with the function <code>a => a.toString</code> as its argument. <code>a</code> is assumed to be of type <code>Unit</code>. If <code>Unit</code> was an exact analogue to <code>void</code>, this wouldn't work. You can't call <code>toString</code> on the absence of something. However, <code>Unit</code> behaves slightly differently, exactly for situations like this, and <code>a</code> will be given an instance of <code>Unit</code>. This instance won't really be able to do much, but it will be able to have <code>toString</code> called on it. So the result of the second command will be a function that returns the result of <code>toString</code> called on the <code>Unit</code> instance, which is: "()"
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1. POCan someone explain what is going on here?
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1. PTAnswer
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1. USnonVirtualThunk
UserOwnerUserId
1. USnonVirtualThunk
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PostLinksRelatedPostIdPostId
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1. VO
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2. VO
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CommentsPostId
1. COIn my browser, my answer appears *below* yours. From personal experience, it's safest to quote posters' names if referencing other replies.
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 USKevin Wright
2. COThanks for pointing that out, adjusted accordingly
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 USnonVirtualThunk

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