facebook ios engineer interview questions

property or member variable in a block that needs to reference an external controller, be sure to use weak references, especially member variables like _testid, where many people do not use weak references and cause memory to be freed.For objects that are normally created, because they are now arc projects, remember that the golden rule of memory management can be solved.18, which third-party libraries have been used?If you've ever developed an app and answered that you haven't used a third-par

IOS interview questions (2) and ios interview questions 1. Q 1. Functions of readwrite, readonly, assign, retain, copy, and nonatomic attributes. 2. When to use delegate and Notification? Iii. Target-Action Mechanism 4. When is t

JAVA engineer interview questionsZookeeper I went to a company for an interview today. I felt dizzy with my brains. I didn't make a few algorithm questions. The questions were relatively simple. I should have prepared myself, but the status was not good, after the

picture suffix 2, how to suffix is tampered with, then each file has a magic digital file upload-magic number5, the principle and implementation of Message Queuing Answer: 1, Message Queuing Principle 2, comprehensible message queue ActiveMQVi. Database Aspects1. The MySQL query field area is not case-sensitive?Answer: Do not differentiate, even if the value is not differentiated (I asked at the time, the area of the application of the size of the meaning of what, the interviewer did not say)2,

Cisco network engineer interview questions 23 Cisco Network interview questions for Cisco senior after-sales network engineers 1. In the current 6509 and 7609, The sup720 switched bandwidth to 720 GB. Can it be said that 7609/6509 can replace part of the GSR status? A: Some

Find an internship to find the heart tired, so in the school BBS found a Sina's scattered strokes.First do a pen test, the title is as follows.1. List the UNIX signals you know and explain their use2, give you an IP address, write its unsigned 32-bit representation3, give you some HTTP stuff post request, data, Cookie,url, write an HTTP header.4. Briefly describe some shell commandsTop/mv/find/sar/touch/wc/chmod/df/strace5, write a program in PHP, print out this month's calendar6, simple SQL que

integer.In other words, a mutex can only be used for mutually exclusive access to a resource, and it cannot implement multi-threaded mutex issues for multiple resources.The semaphore can realize multi-thread mutual exclusion and synchronization of multiple homogeneous resources.When the semaphore is a single-valued semaphore, it is also possible to complete mutually exclusive access to a resource.3. The lock and unlock of the mutex must be used by the same thread, the semaphore can be freed by

Interview records: 1. Interviewer: A girl in her twenties, less than 30 Interview process: A. come up with a good question, let the cool milk in the cool leader and the cool milk in the cool leader's leeching sheath be excited? 0 minutes. For example, the "aabbcddef" character string must be output" I started to understand the question wrong. The program I wrote was wrong. I wrote it again after prompted. :

Sian O M engineer interview questions 1. What are the functions of the following Linux commands? Init 0 Chkconfig -- level 3 sendmail on Tar-czvf test.tar.gz ./ Chown-R www: www/usr/local/apache/htdocs/ Ln-s/data2/log/var/log/sina_log/ [-D/data1/logs] mv/data1/logs/data1/logs. old Rsync 192.168.0.200: software.tar.gz. Umount/data0 Rpm-ivh sina. rpm Rpm-qf/bin/l

[] One of the interview questions for C/C ++, a Linux Application Development Engineer: synchronization of multi-threaded programs in Linux Reference: three methods for Linux Thread Synchronization Link: http://www.cnblogs.com/eleclsc/p/5838790.html Brief answer: In Linux, the most common three methods of thread synchronization are mutex lock, condition variable,

Regular Interview Questions and answers by a ribaba Java engineer, Baba java 1. Implementation of Spring AOP and IOC Http://blog.csdn.net/tarena_lixy/article/details/7096114 Http://blog.csdn.net/kiss_vicente/article/details/6901295 Http://blog.csdn.net/it_man/article/details/4402245 2. Distributed message queue and distributed cache Message Queue: RabbitMQ, Kafka

adapter pattern? Ø database How are you usually optimized, what other tools are used to optimize no, how to use the Ø Now there is a lot of tables to correlate the query SQL, the child table data is very much, then you only from the SQL point of view of the SQL statement optimization, do not need to consider the index, predicate Ø you don't have a Java project, do you? Ø your major is to control the direction, why do the current direction O you have any que