On Dec 31, 2008, at 8:52 AM, Michael Ash wrote:
The fundamental error that everyone is making here is in assuming that
a unichar is a single indivisible unit that can be tossed around at
will. But it doesn't work that way. Sometimes you have multiple
unichars next to each other in a grouping wh
On Dec 31, 2008, at 10:52 AM, Michael Ash wrote:
The key is the usage of -rangeOfComposedCharacterSequenceAtIndex:.
Without calling this method or doing the equivalent to what it does,
your code will suffer the problems I described above.
I tested that code with the string @"abcdéf𝄞g" (that's
On Wed, Dec 31, 2008 at 11:29 AM, Dave DeLong wrote:
> Ironic... This question came up in a job interview I had a couple weeks ago.
> The following NSString category will work to reverse a string, and in my
> limited tests, it works with accents, mathematical symbols, and Korean
> characters:
>
>
Looks like the attachment didn't come along. It's up here:
http://davedelong.com/stuff/stringreverse.png
Dave
On Dec 31, 2008, at 9:29 AM, Dave DeLong wrote:
Ironic... This question came up in a job interview I had a couple
weeks ago. The following NSString category will work to reverse a
Ironic... This question came up in a job interview I had a couple
weeks ago. The following NSString category will work to reverse a
string, and in my limited tests, it works with accents, mathematical
symbols, and Korean characters:
- (NSString *) stringByReversingSelf {
NSMutableS
On Wed, Dec 31, 2008 at 4:28 AM, Peter Hudson wrote:
> I have been using the following for a while across a number of languages
> without problems.
>
>
> NSString *s = @"Hello";
> unsigned int length = [s length];
> unsigned int index = length - 1;
>
> NSMutableArray *ma = [NSMutableArray array
Unfortunately, this is not correct; -[NSString characterAtIndex:]
returns a unichar, which is not a char. In addition, it will give
odd results for composed characters. Depending on what you want,
you might be able to use rangeOfComposedCharacterAtIndex:.
I'd also use NSMutableString inst
On 31/12/2008, at 5:26 PM, Nick Zitzmann wrote:
On Dec 30, 2008, at 10:23 PM, Ron Fleckner wrote:
- (NSString *)reverseString:(NSString *)aString
{
// Do the reversing with the help of an array of chars
int i, j;
const int stringLength = [aString length];
On Wed, Dec 31, 2008 at 12:08 AM, Gabe Shahbazian wrote:
> What is the best way to take an NSString and reverse the characters so that
> "hello" becomes "olleh"?
This doesn't make sense for all locales. Are you sure you want to do this?
--Kyle Sluder
On Dec 30, 2008, at 10:23 PM, Ron Fleckner wrote:
- (NSString *)reverseString:(NSString *)aString
{
// Do the reversing with the help of an array of chars
int i, j;
const int stringLength = [aString length];
char reverseChars[stringLength];
for (
In general, it would perhaps be best to create a c string from the
NSString using the proper text encoding and then iterating through the
C string in reverse, appending each character to an NSMutableString.
Iterating through each character of an NSString is likely to be slow
and the usage
On Dec 31, 2008, at 4:42 PM, Graham Cox wrote:
On 31 Dec 2008, at 4:35 pm, Graham Cox wrote:
I don't think this is legal
Hmm, seems C99 allows this. I didn't know that - my bad.
Personally, I avoid variable length arrays out of fear that the
allocation might fail. On 10.3 or 10.4 I ran
On 31/12/2008, at 4:42 PM, Graham Cox wrote:
On 31 Dec 2008, at 4:35 pm, Graham Cox wrote:
I don't think this is legal
Hmm, seems C99 allows this. I didn't know that - my bad.
--Graham
Ha ha, yes. I resisted trying to explain that because I wouldn't be
able to do it properly. I did
On Dec 31, 2008, at 4:23 PM, Ron Fleckner wrote:
const int stringLength = [aString length];
char reverseChars[stringLength];
for (i = stringLength - 1, j = 0; i >= 0; i--, j++)
{
char c = [aString characterAtIndex:i];
reverseChars[j
On 31 Dec 2008, at 4:35 pm, Graham Cox wrote:
I don't think this is legal
Hmm, seems C99 allows this. I didn't know that - my bad.
--Graham
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On 31 Dec 2008, at 4:23 pm, Ron Fleckner wrote:
char reverseChars[stringLength];
Have you tested this? I don't think this is legal - you can't declare
a statically sized array with a dynamically computed size. The
compiler might let it through because stringLength is declared const,
ev
On 31/12/2008, at 4:08 PM, Gabe Shahbazian wrote:
What is the best way to take an NSString and reverse the characters
so that
"hello" becomes "olleh"?
Thanks for any and all help,
Gabe S
Hi Gabe.
I don't think there's anything in Cocoa that does this for you. I
needed to reverse strings
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