Re: copy versus arrayWithArray:
Re: copy versus arrayWithArray:
- Subject: Re: copy versus arrayWithArray:
- From: "stephen joseph butler" <email@hidden>
- Date: Fri, 18 Aug 2006 09:37:29 -0500
2006/8/18, Greg Hurrell <email@hidden>:
Except that the two statements aren't equivalent. A copy of a mutable
array yields another mutable array (the poster said that "orig" is a
mutable array). Conversely, NSArray's arrayWithArray: will return an
immutable array (which is arguably better in this case because in
many cases immutable arrays are faster than mutable ones).
Are you sure? This is in F-Script,
a := NSMutableArray array
a addObject:'test 1'
a addObject:'test 2'
a addObject:'test 3'
a
NSCFArray {'test 1', 'test 2', 'test 3'}
b := a copy
b
NSCFArray {'test 1', 'test 2', 'test 3'}
b addObject:'test 4'
NSInternalInconsistencyException: *** -[NSCFArray addObject:]:
mutating method sent to immutable object
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