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How can I convert NSDictionary to NSData and vice versa?
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NSDictionary -> NSData:
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:yourDictionary forKey:@"Some Key Value"];
[archiver finishEncoding];
[archiver release];
// Here,...
How do I time a method's execution in Java?
...ours(), between.toMinutes(), between.getSeconds(), between.toMillis()); // 0D, 00:00:01.1001
Spring Framework provides StopWatch utility class to measure elapsed time in Java.
StopWatch sw = new org.springframework.util.StopWatch();
sw.start("Method-1"); // Start a named task
Thread.slee...
How can I use Autolayout to set constraints on my UIScrollview?
...m sure you are aware):
UIView *containerView = [[UIView alloc] init];
UIScrollView *scrollView = [[UIScrollView alloc] init];
[containerView addSubview:scrollView];
containerView.translatesAutoresizingMaskIntoConstraints = NO;
scrollView.translatesAutore...
How to remove elements from a generic list while iterating over it?
...Int % 2 == 0) { test.Remove(myInt); } } You still have to allocate a copy for Reverse and it introduces Huh? moment - why is there Reverse.
– jahav
May 25 '15 at 13:38
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Correct way to load a Nib for a UIView subclass
... want to load your CustomView, use the following line of code
[[CustomView alloc] init];
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Most efficient way to remove special characters from string
... @SILENT: No, it doesn't, but you should only do that once. If you allocate an array that large each time you call the method (and if you call the method frequently) then the method becomes the slowest by far, and causes a lot of work for the garbage collector.
– Guffa
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加密签名使用指导 · App Inventor 2 中文网
...文本输入框1.Text))
}
输入 abc，标签显示 MD5：900150983cd24fb0d6963f7d28e17f72。
案例一：登录前给密码做摘要
不要把明文密码直接发给服务器或存在手机上。先加一段固定的”盐”再做 SHA256，服务器端用同样的方法...
Build tree array from flat array in javascript
...ance with functional programming (no mutations)
– Dac0d3r
Apr 29 at 20:54
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How to efficiently concatenate strings in go
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If you know the total length of the string that you're going to preallocate then the most efficient way to concatenate strings may be using the builtin function copy. If you don't know the total length before hand, do not use copy, and read the other answers instead.
In my tests, that approa...
Thou shalt not inherit from std::vector
...the absence of a virtual destructor is only a problem if the derived class allocates resources which must be freed upon destruction. (They wouldn't be freed in a polymorphic use case because a context unknowingly taking ownership of a derived object via pointer to base would only call the base dest...