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With 10.8 SDK, `#define OBJC_OLD_DISPATCH_PROTOTYPES 0` at the top of your file or PCH to get errors if you use objc_msgSend without a cast.

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Wrong:
__weak id obj;
dispatch_async(queue, ^() {
[obj doSomething];
[obj doSomethingElse]; <- can turn to nil at any point, should store in strong at beggining of block
[obj doSomethingElse2];
});

Ok:

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#import <Foundation/Foundation.h>
 
@interface A : NSObject
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler;
@end
 
@implementation A
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler
{
  NSLog(@"object: %@", o);

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# For training rest 5 min on compounds, 3-5 minutes on smaller ones

# Training A (first set to failure, second set -10% weight + 1 rep):
# Deadlift - 2x4-5
# Overhead Press - 1x6-8
# Weighted Chinup - 2x4-6
# Chest-Supported Rows - 2x6-8
# Close-grip chinup - 1x6-10

# Training B (first set to failure, second set -10% weight + 1 rep):

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#!/usr/bin/env ruby
require 'net/http'
require 'openssl'

# Track public available information of a twitter user like follower, follower
# and tweet count by scraping the user profile page.

# Config
# ------
twitter_username = ENV['TWITTER_USERNAME'] || 'foobugs'

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- (void)bindLifetimeToObject:(id)object
{
  objc_setAssociatedObject(object, (__bridge void *)self, self, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void)releaseLifetimeFromObject:(id)object
{
  objc_setAssociatedObject(object, (__bridge void *)self, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

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- (void)viewWillAppear:(BOOL)animated
{
        [UIView animateWithDuration:animated ? 0.25f : 0.0f animations:^
        {
            // Some manipulation
        } completion:^
        {
            // Some completion action
        }]
}

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    //! raw builder
    TMTween(self.view).animate(@"frame.origin.x", ^(TMTween *tween) {
      tween.from = tween.view.left;
      tween.to = 110;
      tween.duration = 1.5;
      tween.options = PMTweenOptionNone;
      tween.easing = easing;
    }).animate(@"backgroundColor.blue", ^(TMTween *tween) {
      tween.from = 0.3f;
      tween.to = 1.0;

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@implementation KZPropertyMapper (MyAppBoxing)

+ (NSDate *)boxValueAsDateSince1970:(id)value __used
{
  if (value == nil) {
    return nil;
  }
  AssertTrueOrReturnNil([value isKindOfClass:NSNumber.class]);
  return [NSDate dateWithTimeIntervalSince1970:[value floatValue]];
}

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when_modified((@[self.counterLabel, self.textView]), ^(id weakSelf) {
  [weakSelf updateCharacterLimit];
});