StackOverflow2013

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plurals

PO
primarykey
Id
872752
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2009-05-16T16:24:40.950
FavoriteCount
0
LastActivityDate
2009-05-16T16:24:40.950
LastEditDate
LastEditorUserId
0
OwnerUserId
25646
ParentId
871796
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
There are two standard patterns for achieving what you want. (1) write a many argument form of a method and then provide fewer argument convenience versions. For example, consider the following methods on NSString: <pre><code>- (NSComparisonResult)compare:(NSString *)string; - (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask; - (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask range:(NSRange)compareRange; - (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask range:(NSRange)compareRange locale:(id)locale; </code></pre> The first three are conceptually [and likely concretely, I didn't check] implemented as calls through to the fourth version. That, is -compare: calls -compare:options:range:locale: with appropriate default values for the three additional arguments. (2) The other pattern is to implement the many argument version of the method and provide default values when an argument is NULL/nil or set to some value that indicates the default is desired. NSData has methods that are implemented with this pattern. For example: <pre><code>+ (id)dataWithContentsOfFile:(NSString *)path options:(NSDataReadingOptions)readOptionsMask error:(NSError **)errorPtr; </code></pre> If you pass 0 for the readOptionsMask argument, the NSData will read the contents of the file using an internally defined default configuration. That default configuration may change over time.
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