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#import <Foundation/Foundation.h>

// clang -g -fobjc-arc -framework Foundation -o array array.m

void observeObject (id objectToWatch) {
    // Just a stub to give DTrace something to hook in to.
}

int main (void) {
    @autoreleasepool {

ytlvy

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

ytlvy

编程语言

• Swift
• Objective-C
• C++/C
• JavaScript

操作系统

• Mac OSX
• iOS

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//
//  UIButton+Block.h
//  BoothTag
//
//  Created by Josh Holtz on 4/22/12.
//  Copyright (c) 2012 Josh Holtz. All rights reserved.
//

#define kUIButtonBlockTouchUpInside @"TouchInside"

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// The MIT License (MIT)

// Copyright (c) 2014 Jan Cássio

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

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- (BOOL)stringContainsEmoji:(NSString *)string {
    __block BOOL returnValue = NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:
     ^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
         
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff) {
             if (substring.length > 1) {
                 const unichar ls = [substring characterAtIndex:1];

ytlvy

#import <QuartzCore/QuartzCore.h>

@interface ArrowLayer : CALayer

@property (nonatomic) CGFloat thickness;
@property (nonatomic) CGFloat startRadians;
@property (nonatomic) CGFloat lengthRadians;
@property (nonatomic) CGFloat headLengthRadians;

@property (nonatomic, strong) UIColor *fillColor;

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/* ps -axco "pid= comm=" | awk '{printf "pnames[%s]", $1; $1=""; sub(/^ /, "", $0); printf " = \x22%s\x22;\n", $0}' > /tmp/pnames.h; sudo dtrace -C -I/tmp -s signals.d */

#pragma D option quiet

dtrace:::BEGIN
{
#include "pnames.h"

    snames[0] = "_QUERY_";
    snames[1] = "SIGHUP";

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  .section	__TEXT,__text,regular,pure_instructions
	.globl	_insert
	.align	4, 0x90
_insert:                                ## @insert
	.cfi_startproc
## BB#0:
	pushq	%rbp
Ltmp2:
	.cfi_def_cfa_offset 16
Ltmp3:

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#include "copyfile.h"

typedef enum {
    _NotStarted = 0,
    _InProgress,
    _Finished,
} _State;

@implementation BAVAppDelegate
{