iamleeg

// hey, we've all got a coding interview to crack, right?

#import <Foundation/Foundation.h>

@interface FZBZSparseArray : NSArray
- initWithCount:(NSUInteger)count placeholder:placeholder overrides:overrides;
@end

@interface FZBZWrappedArray : NSArray
- initWrappingArray:underlyingArray;

iamleeg

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface ContractEnforcer<T> : NSProxy

- (T)initWithTarget:(T)target;

+ (T)enforcerWithTarget:(T)target;

iamleeg

Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
 "/Applications/Xcode_6_3_2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.9.0 -syslibroot /Applications/Xcode_6_3_2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -o /Users/leeg/Library/Developer/Xcode/DerivedData/ClassBrowser-gmbtduezhzgclfddsisfkakriqlj/Build/Products/Debug/ClassBrowser.app/Contents/MacOS/ClassBrowser -L/Users/leeg/Library/Developer/Xcode/DerivedData/ClassBrowser-gmbtduezhzgclfddsisfkakriqlj/Build/Products/Debug -L/usr/local/lib -filelist /Users/leeg/Library/Developer/Xcode/DerivedData/ClassBrowser-gmbtduezhzgclfddsisfkakriqlj/Build/Intermediates/ClassBrowser.build/Debug/ClassBrowser.build/Objects-normal/x86_64/ClassBrowser.LinkFileList -lLLVMLTO -lLLVMObjCARCOpts -lLLVMLinker -lLLVMBitWriter -lLLVMIRReader -lLLVMBPFCodeGen -lLLVMBPFDesc -lLLVMBPFInfo -lLLVMBP

iamleeg

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface Mutable : NSObject

@property (nonatomic, retain) id x;

@end

@implementation Mutable

iamleeg

import Cocoa

typealias Selector = String

enum IMP {
  case accessor((Selector->IMP, Selector)->((Selector)->IMP)?)
  case asInteger((Selector->IMP, Selector)->Int?)
  case methodMissing((Selector->IMP, Selector)->((Selector)->IMP)?)
  case mutator((Selector->IMP, Selector, Selector->IMP)->Void)
  case description((Selector->IMP, Selector)->String?)

iamleeg

#import <Foundation/Foundation.h>
#include <pthread.h>

void logExactlyOnce(void)
{
    static __thread dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        NSLog(@"Only done once?");
    });
}

iamleeg

#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);

iamleeg

#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);

iamleeg

#import <UIKit/UIKit.h>

UIColor * operator"" _c(unsigned long long color)
{
    unsigned long long redComponent = (color & 0xff0000 >> 16);
    unsigned long long greenComponent = (color & 0x00ff00) >> 8;
    unsigned long long blueComponent = color & 0xff;
    float red = redComponent / 255.0;
    float green = greenComponent / 255.0;
    float blue = blueComponent / 255.0;

iamleeg

#import <Foundation/Foundation.h>
#import <dispatch/dispatch.h>
#import <objc/runtime.h>

void printMethodList(Class cls, const char *prefix)
{
	const char *className = class_getName(cls);
	unsigned int countOfMethods;
	Method *methodList = class_copyMethodList(cls, &countOfMethods);
	for(unsigned int i = 0; i < countOfMethods; i++)