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How to store CGRect values in NSMutableArray?
...
CGRect rect = CGRectMake( 5, 5, 40, 30 );
NSString* rectAsString = NSStringFromCGRect( rect );
CGRect original = CGRectFromString( rectAsString );
What do you think about this way to store CGRect dates?
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XML attribute vs XML element
...butes vs. elements:
Use elements for long running text (usually those of string or
normalizedString types)
Do not use an attribute if there is grouping of two values (e.g.
eventStartDate and eventEndDate) for an element. In the previous example,
there should be a new element for "event" which ma...
Convert array to JSON
...ub.com/douglascrockford/JSON-js/blob/master/json2.js
And call:
var myJsonString = JSON.stringify(yourArray);
Note: The JSON object is now part of most modern web browsers (IE 8 & above). See caniuse for full listing. Credit goes to: @Spudley for his comment below
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What is the difference between a var and val definition in Scala?
...B(n: Int) {
val value = new A(n)
}
object Test {
def main(args: Array[String]) {
val x = new B(5)
x = new B(6) // Doesn't work, because I can't replace the object created on the line above with this new one.
x.value = new A(6) // Doesn't work, because I can't replace the object assi...
Function to clear the console in R and RStudio
...ws,
shell("clear") if on Linux or Mac.
(shell() passes a command (or any string) to the host terminal.)
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Do NSUserDefaults persist through an Update to an app in the Appstore?
...a, NSUserDefaults is the best way to save data such as preferences, dates, strings etc. If you are looking to save images and files, the file system is a better bet.
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Save plot to image file instead of displaying it using Matplotlib
I am writing a quick-and-dirty script to generate plots on the fly. I am using the code below (from Matplotlib documentation) as a starting point:
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Best practices for overriding isEqual: and hash
...iplying the result by each variable hash your result will overflow. eg. [NSString hash] creates large values. If you have 5+ variables it's easy to overflow with this algorithm. It'll result in everything mapping to the same hash, which is bad. See my response: stackoverflow.com/a/4393493/276626
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...尽可能少重复
处理选项
在C#中，你可以使用Regex(String, RegexOptions)构造函数来设置正则表达式的处理选项。如：Regex regex = new Regex(@"\ba\w{6}\b", RegexOptions.IgnoreCase);
上面介绍了几个选项如忽略大小写，处理多行等，这些选项...
Differences between contentType and dataType in jQuery ajax function
...ntType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a content-type to $.ajax(), then it'll alwa...