js

func fetch1(where predicateFormat: String, _ args: CVarArg...) {
    // using: public convenience init(format predicateFormat: String, _ args: CVarArg...)
    let predicate = NSPredicate(format: predicateFormat, args)
    print("fetch1 predicate: \(predicate)")
}

func fetch2(where predicateFormat: String, _ args: Any...) {
    // Using: public init(format predicateFormat: String, argumentArray arguments: [Any]?)
    let predicate = NSPredicate(format: predicateFormat, argumentArray: args)
    print("fetch2 predicate: \(predicate)")

js

function current_git_branch
	sh -c 'git branch --no-color 2> /dev/null' | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
end

js

// weak-strong dance by shadowing self
foo { [weak self] in
  guard let `self` = self else { return }
  self.bar()
}

js

// Output on this particular Mac
//
// Exceptions took 5.054922
// BOOL return + NSError took 0.251062
// 

#import <Foundation/Foundation.h>
#import <mach/mach_time.h>

static inline void TimeDuration(NSString *description, NSUInteger runs, dispatch_block_t block)

js

(lldb) racbt
error: Trying to put the stack in unreadable memory at: 0x10f23ef80.
(lldb) bt
* thread #15: tid = 0x2cd18a, 0x00007fff90136fe6 libobjc.A.dylib`objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*>, objc::DenseMapInfo<unsigned long> >::find(objc_object* const&) + 4, queue = 'com.apple.root.default-priority, stop reason = EXC_BAD_ACCESS (code=2, address=0x10f23eff8)
    frame #0: 0x00007fff90136fe6 libobjc.A.dylib`objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*>, objc::DenseMapInfo<unsigned long> >::find(objc_object* const&) + 4
    frame #1: 0x00007fff90136f5b libobjc.A.dylib`_objc_rootReleaseWasZero + 126
    frame #2: 0x00007fff9014f6f1 libobjc.A.dylib`-[NSObject release] + 17
    frame #3: 0x00000001001fbe53 ReactiveCocoa`-[RACBacktrace .cxx_destruct](self=0x0000000102188800, _cmd=0x00007fff8e87e360) + 51 at RACBacktrace.m:153

js

// GHDUserViewController.m in the 

// Take 1

- (id)initWithUserAccount:(GHGitHubUser *)user {
    // .. snip ..
  [[[RACSignal 
       merge:@[[self fetchUser], [self fetchRepos], [self fetchOrgs]]]
		finally:^{
			@strongify(self);