Re: Reversing a String
Re: Reversing a String
- Subject: Re: Reversing a String
- From: Dave DeLong <email@hidden>
- Date: Wed, 31 Dec 2008 09:32:10 -0700
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
string, and in my limited tests, it works with accents, mathematical
symbols, and Korean characters:
- (NSString *) stringByReversingSelf {
NSMutableString * r = [NSMutableString stringWithString:self];
NSUInteger len = [r length];
NSUInteger mid = floor(len/2);
for(int i = 0; i < mid; i++) {
NSRange fr = NSMakeRange(i,1);
NSRange lr = NSMakeRange(len-i-1,1);
NSString * f = [r substringWithRange:fr];
NSString * l = [r substringWithRange:lr];
[r replaceCharactersInRange:fr withString:l];
[r replaceCharactersInRange:lr withString:f];
}
return r;
}
Here's the output of my extremely limited tests: (attached as a .png
screenshot so that the encoding doesn't get messed up)
Cheers,
Dave
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