time to produce a series of NSString

time_list_of_nsstring.m

#import <Foundation/Foundation.h>
#import <mach/mach_time.h>

// 0 .. 4
#define TEST    0

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSString *aString;
        uint64_t start, elapsed;
        mach_timebase_info_data_t base;
        mach_timebase_info(&base);

        start = mach_absolute_time();
        for ( int i = 0; i < 100; i++ ) {
            @autoreleasepool {
                
            aString = @"";
#if TEST == 0
            NSMutableString *muString = [NSMutableString string];
            for ( int j = 0; j < 100; j++ ) {
                [muString appendFormat:@"Time Test (%d)\n",j];
            }
            // time = 4343708(nsec)
#elif TEST == 1
            for ( int j = 0; j < 100; j++ ) {
                aString = [aString stringByAppendingFormat:@"Time Test (%d)\n",j];
            }
            // time = 25425541(nsec)
#elif TEST == 2
            for ( int j = 0; j < 100; j++ ) {
                aString = [NSString stringWithFormat:@"%@\nTime Test (%d)",aString,j];
            }
            // time = 19513834(nsec)
#elif TEST == 3
            NSMutableArray *anArray = [NSMutableArray array];
            for ( int j = 0; j < 100; j++ ) {
                [anArray addObject:[NSString stringWithFormat:@"Time Test (%d)",j]];
            }
            aString = [anArray componentsJoinedByString:@"\n"];
            // time = 13281454(nsec)
#elif TEST == 4
            NSMutableArray *anArray = [NSMutableArray arrayWithCapacity:100];
            for ( int j = 0; j < 100; j++ ) {
                [anArray addObject:[NSString stringWithFormat:@"Time Test (%d)",j]];
            }
            aString = [anArray componentsJoinedByString:@"\n"];
            // time = 12225972(nsec)
#endif
            }
        }
        elapsed = mach_absolute_time() - start;
        uint64_t nsec = elapsed * base.numer / base.denom;
        printf("time = %lld(nsec)\n",nsec);
    }
    return 0;
}