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How can I reverse a NSArray in Objective-C?
...ne. If I see a method that returns an immutable object, I expect it to actually be returning an immutable object. Having it appear to return an immutable object but actual return a mutable object is a dangerous practice to get into.
– Christine
Jul 2 '12 at 22:...
How to validate a url in Python? (Malformed or not)
...t work for IPv6 urls, which have the form http://[2001:0DB8::3]:8080/index.php?valid=true#result
– cimnine
Feb 4 '18 at 20:42
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show 6 more ...
Pick a random element from an array
...om_uniform(UInt32(self.count)))
return self[index]
}
}
For example:
let myArray = [1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16]
let myItem = myArray.randomItem() // Note: myItem is an Optional<Int>
share
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What's the difference between using CGFloat and float?
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@QuinnTaylor can you provide a practical example of how float would overflow while CGFloat would not? Both float and CGFloat have a finite number of bits. You can overflow both of them by needing to store more bits than they can hold.
– Pwner
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Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...服务的服务器上，解压下载的docker安装包；
sudo tar -xvf docker-26.1.4-x86_64.tgz
# 给docker执行文件赋予可执行权限
sudo chmod 755 -R docker
# 复制docker到/usr/bin/目录下，使docker命令可以执行
sudo cp docker/* /usr/bin/
# 清理...
Cron job every three days
...ring the introduction of the concept of when such patterns "reset". For example, is the pattern reset when the time is changed (i.e. the crontab entry is revised)? Look to your favorite calendar app to see how complicated it can get to express Repeating patterns of scheduled events, and note that ...
如何设置squid使外网也可以通过代理服务器上网，并且使用代理服务器的ip地...
...chy_stoplist -i ^https:\\ ?
acl QUERY urlpath_regex -i cgi-bin \? \.asp \.php \.jsp \.cgi
acl QUERY urlpath_regex cgi-bin .php .cgi .avi .wmv .rm .ram .mpg .mpeg .zip .exe
cache deny QUERY
acl denyssl urlpath_regex -i ^https:\\
no_cache deny QUERY
no_cache deny denyssl
ipcache_size 1024
ipca...
How to make “if not true condition”?
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I like this version. What about adding 1>&2 at the end of your echo to print on stderr ?
– Julien
Nov 26 '15 at 11:32
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Running the new Intel emulator for Android
... compared to a real device. is this a good configuration: tinypic.com/view.php?pic=efgv83&s=6 ?
– android developer
May 27 '12 at 7:51
1
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How to scroll to the bottom of a UITableView on the iPhone before the view appears
I have a UITableView that is populated with cells of a variable height. I would like the table to scroll to the bottom when the view is pushed into view.
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