How can I join a string repeatedly?

Question

I want to do something like:

string s1 set to null
s2: "abc"

repeat 10 times

s1=s1+s2

How can I do this in objective-c?

hermos · Accepted Answer · 2010-07-31 12:06:26Z

3

Is this suitable?:

NSMutableString *s1 = [[NSMutableString alloc] initWithString:@""];
NSString *s2 = @"abc";

for(NSInteger idx = 0; idx < 10; ++idx) {
   [s1 appendString:s2];
}

...

[s1 release];

answered Jul 31, 2010 at 12:06

hermos

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2 Comments

mvds Over a year ago

+1. But in spirit of obj-c memory management rules and the bugs we see here so often, maybe better call [NSMutableString stringWithString:@""] to get an autoreleased string.

Wevah Over a year ago

Or just [NSMutableString string].

mvds · Accepted Answer · 2010-07-31 12:33:04Z

0

Although @thatsdisgusting gave a perfect answer, here's a shortcut:

NSMutableString *a = [NSMutableString stringWithCapacity:0];
NSString *pad = @"abc";
NSString *ret = [a stringByPaddingToLength:10*[pad length] withString:pad
                                                           startingAtIndex:0];

abusing stringByPaddingToLength.

answered Jul 31, 2010 at 12:33

mvds

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