Array access performance tests

gistfile1.txt

/*

Results on iPad 4th gen with -O3 compiler optimizations:

2013-06-17 10:37:34.688 Labs Project[11717:907] for loop took 0.160626 seconds
2013-06-17 10:37:36.691 Labs Project[11717:907] enumerateObjectsUsingBlock took 0.159356 seconds

*/

{
    NSInteger interations = 1000000;
    
    NSMutableArray *array = [NSMutableArray array];
    for (int i=0; i<interations; i++) {
        [array addObject:[NSNumber numberWithInt:arc4random()]];
    }
    
    array = [array copy];
    
    
    __block int oddCount = 0;
    CFAbsoluteTime time, end;
    
    time = CFAbsoluteTimeGetCurrent();
    oddCount = 0;
    for (NSNumber *number in array) {
        [self doSomethingWithInteger:number];
    }
    
    end = CFAbsoluteTimeGetCurrent();
    
    NSLog(@"for loop took %f seconds", end - time);
    
    array = [NSMutableArray array];
    for (int i=0; i<interations; i++) {
        [array addObject:[NSNumber numberWithInt:arc4random()]];
    }
    
    array = [array copy];
    
    time = CFAbsoluteTimeGetCurrent();
    [array enumerateObjectsUsingBlock:^(NSNumber *obj, NSUInteger idx, BOOL *stop) {
        [self doSomethingWithInteger:obj];
    }];
    end = CFAbsoluteTimeGetCurrent();
    
    NSLog(@"enumerateObjectsUsingBlock took %f seconds", end - time);

...
}

-(void)doSomethingWithInteger:(NSNumber *)number {
    static NSInteger oddCount = 0;
    
    if (number.integerValue & 1) {
        oddCount++;
    }
}