plantpurecode

@interface UIView (JRHierarchyAdditions) 
- (void)bringToFront;
- (void)sendToBack;
@end

@implementation UIView (JRHierarchyAdditions)
   
- (void)bringToFront {
   [[self superview] bringSubviewToFront:self];
}

plantpurecode

//GCD way:

double delayInSeconds = (24 * 60) * 60;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    [self setAge:[self age] + 1];
});


//NSInvocation way:

plantpurecode

@implementation NSIndexPath (JRAdditions)

- (NSIndexPath *) indexPathByAddingRows:(NSInteger)rows andSections:(NSInteger)sections {
    NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:MIN(NSIntegerMax, [self row] + rows)
                                                   inSection:MIN(NSIntegerMax, [self section] + sections)];
    return newIndexPath;
}

- (NSIndexPath *) indexPathByAddingRows:(NSInteger) rows {
    return [self indexPathByAddingRows:rows andSections:0];

plantpurecode

@interface NSArray (JRAdditions)

- (id) safeObjectAtIndex:(NSUInteger)index;

@end

@implementation NSArray (JRAdditions)

- (id) safeObjectAtIndex:(NSUInteger)index {
   @synchronized(self) {

plantpurecode

@interface JRObject : NSObject @end

@implementation JRObject

- (void)doesNotRecognizeSelector:(SEL)selector {
   NSLog(@"Attempted to invoke %s on %@", selector, self);
}

@end

plantpurecode

@interface NSArray(JRAdditions)

- (id)jr_objectAtIndex:(long long)index {
   NSUInteger realIndex = index;
   if(index < 0) {
      realIndex = [self count] - (+index);
   }

   return [self objectAtIndex:realIndex];
}

plantpurecode

- (void)printRecursivelyUpTo:(NSUInteger)max {
   __block dispatch_block_t block;
   __block NSUInteger iterator = 0;

   dispatch_block_t b = ^{
      if(iterator == max) return;
      NSLog(@"%u", iterator);
      ++iterator;
      block();
   };

plantpurecode

@interface NSLock (JRAdditions)

- (void)lockWithBlock:(dispatch_block_t)block;

@end

plantpurecode

typedef void (^JRIterationBlock)(NSUInteger index);

static inline void invokeBlockIterativelyUsingRange(JRIterationBlock block, NSRange rng) {
    NSParameterAssert(block); 
    for(NSUInteger i = rng.location; i < NSMaxRange(rng); ++i) {
        block(i);
    }
}

@implementation NSNumber (BlockAdditions)

plantpurecode

@interface NSCountedSet (JRCountedSetAdditions)

- (NSArray *) objectsWithCount:(NSUInteger) count;

@end