Obj-C Command-line Sort Example

sort.m

#import <Foundation/Foundation.h>

#define randomNumber() (arc4random() % ((unsigned)1000000 + 1))

@interface MainHelper : NSObject
+ (NSArray *)largeArrayCreate;
@end

@implementation MainHelper
+ (NSArray *)largeArrayCreate
{
    int sizeOfArray = 40000;
    NSMutableArray *mutableArray = [[NSMutableArray alloc] initWithCapacity:sizeOfArray];
    for (int i=0; i < sizeOfArray; i++) {
        NSInteger value = randomNumber();
        NSString *string = [NSString stringWithFormat:@"%ld", value]; 
        [mutableArray addObject:string];
    } 

    return [mutableArray copy];
}
@end

int main(int argc, char *argv[])
{
    @autoreleasepool {
        NSArray *array1 = [MainHelper largeArrayCreate];
        NSArray *array2 = [MainHelper largeArrayCreate];

        NSLog(@"Array 1: %ld, Array 2: %ld", [array1 count], [array2 count]);

        NSMutableSet *mutableSet = [[NSMutableSet alloc] initWithArray:array1];
        [mutableSet addObjectsFromArray:array2];

        NSArray *result = [[mutableSet allObjects] sortedArrayUsingSelector:@selector(compare:)];

        NSLog(@"Resulting array size %ld", [result count]);
    }

    return 0;
}

Compile

cc -ObjC -framework Foundation sort.m -o sort

Run

./sort