Testing using JSON data vs an NSObject with properties. Testing initialization of NSObjects and calculations of keyPath values using @AvG. Tested with CodeRunner: http://krillapps.com/coderunner/ Results: http://bit.ly/12zlUNp

gistfile1.txt

#import <Foundation/Foundation.h>

@interface Hospital : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *address;
@property (nonatomic, strong) NSString *city;
@property (nonatomic, strong) NSString *county;
@property (nonatomic, strong) NSString *state;
@property (nonatomic, strong) NSNumber *annualVisitors;
@property (nonatomic, strong) NSString *zip;
- (id)initWithJSON:(NSDictionary *)json;
@end
@implementation Hospital
- (id)initWithJSON:(NSDictionary *)json {
  if (self = [super init]) {
		self.name = json[@"Hospital"];
		self.address = json[@"Address"];
		self.city = json[@"City"];
		self.county = json[@"County"];
		self.state = json[@"State"];
		self.annualVisitors = json[@"AnnualERVisitors"];
		self.zip = json[@"Zip"];
	}
	return self;
}
@end

CGFloat runWithObject() {
	NSArray *hospitalJSON = @[@{@"Hospital" : @"JACKSON MEDICAL CENTER",
		                   @"Address" : @"220 Hospital Drive",
		                   @"City" : @"Jackson",
		                   @"County" : @"Clarke",
		                   @"State" : @"AL",
		                   @"AnnualERVisitors" : @(3322),
		                   @"Zip" : @"36545"},
		                 @{@"Hospital" : @"JACKSON MEDICAL CENTER 2",
		                   @"Address" : @"227 Hospital Drive",
		                   @"City" : @"Jackson",
		                   @"County" : @"Clarke",
		                   @"State" : @"AL",
		                   @"AnnualERVisitors" : @(6422),
		                   @"Zip" : @"36545"},
		                 @{@"Hospital" : @"PASCO REGIONAL MEDICAL CENTER",
		                   @"Address" : @"13100 Ft King Road",
		                   @"City" : @"Dade City",
		                   @"County" : @"PASCO",
		                   @"State" : @"FL",
		                   @"AnnualERVisitors" : @(4125),
		                   @"Zip" : @"33525"},
		                 @{@"Hospital" : @"MACNEAL HOSPITAL",
		                   @"Address" : @"3249 South Oak Park Avenue",
		                   @"City" : @"Berwyn",
		                   @"County" : @"COOK",
		                   @"State" : @"IL",
		                   @"AnnualERVisitors" : @(4432),
		                   @"Zip" : @"60402"}];
		
	NSMutableArray *arr = [NSMutableArray array];
	for(id raw in hospitalJSON) {
		Hospital *hospital = [[Hospital alloc] initWithJSON:raw];
		[arr addObject:hospital];
	}
	
	NSDate *start = [NSDate date];
	NSNumber *avg = [arr valueForKeyPath:@"@avg.annualVisitors"];
	NSDate *finish = [NSDate date];
	return [finish timeIntervalSinceDate:start];
}

CGFloat runWithDictionary() {
	NSArray *hospitalJSON = @[@{@"Hospital" : @"JACKSON MEDICAL CENTER",
		                   @"Address" : @"220 Hospital Drive",
		                   @"City" : @"Jackson",
		                   @"County" : @"Clarke",
		                   @"State" : @"AL",
		                   @"AnnualERVisitors" : @(3322),
		                   @"Zip" : @"36545"},
		                 @{@"Hospital" : @"JACKSON MEDICAL CENTER 2",
		                   @"Address" : @"227 Hospital Drive",
		                   @"City" : @"Jackson",
		                   @"County" : @"Clarke",
		                   @"State" : @"AL",
		                   @"AnnualERVisitors" : @(6422),
		                   @"Zip" : @"36545"},
		                 @{@"Hospital" : @"PASCO REGIONAL MEDICAL CENTER",
		                   @"Address" : @"13100 Ft King Road",
		                   @"City" : @"Dade City",
		                   @"County" : @"PASCO",
		                   @"State" : @"FL",
		                   @"AnnualERVisitors" : @(4125),
		                   @"Zip" : @"33525"},
		                 @{@"Hospital" : @"MACNEAL HOSPITAL",
		                   @"Address" : @"3249 South Oak Park Avenue",
		                   @"City" : @"Berwyn",
		                   @"County" : @"COOK",
		                   @"State" : @"IL",
		                   @"AnnualERVisitors" : @(4432),
		                   @"Zip" : @"60402"}];
		
	NSDate *start = [NSDate date];
	NSNumber *avg = [hospitalJSON valueForKeyPath:@"@avg.AnnualERVisitors"];
	NSDate *finish = [NSDate date];
	return [finish timeIntervalSinceDate:start];
}

NSInteger const runCount = 1000000;

void testObject() {
	NSDate *objectStart = [NSDate date];
	CGFloat executionRunTime = 0.f;
	
	for (int i = 0; i < runCount; i++) {
		executionRunTime += runWithObject();
	}
	
	NSLog(@"Execution time: %f",executionRunTime);
	
	NSDate *objectFinish = [NSDate date];
	NSTimeInterval objectExecutionTime = [objectFinish timeIntervalSinceDate:objectStart];
	NSLog(@"Total Object time: %f", objectExecutionTime);
}

void testDictionary() {
	NSDate *dictionaryStart = [NSDate date];
	CGFloat executionRunTime = 0.f;
	
	for (int i = 0; i < runCount; i++) {
		executionRunTime += runWithDictionary();
	}
	
	NSLog(@"Execution time: %f",executionRunTime);
	
	NSDate *dictionaryFinish = [NSDate date];
	NSTimeInterval dictionaryExecutionTime = [dictionaryFinish timeIntervalSinceDate:dictionaryStart];
	NSLog(@"Total Dictionary time: %f", dictionaryExecutionTime);
}

int main(int argc, char *argv[]) {
	@autoreleasepool {
		// only run 1 test at a time
		testObject();
//		testDictionary();
	}
}