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What is an optional value in Swift?
...he provided constant and executes the block. In Xcode 8.3 and later (Swift 3.1), trying to print an optional like this will cause a useless warning. Use the optional's debugDescription to silence it:
print("\(mealPreference.debugDescription)")
What are optionals for?
Optionals have two use cases:
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TypeScript: casting HTMLElement
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after 1.0, the syntax should be (<NodeListOf<HTMLScriptElement>>document.getElementsByName(id))[0];
– Will Huang
Jul 10 '14 at 12:42
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resize ipython notebook output window
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This is SO AWESOME and still works with Jupyter 1.0+
– rjurney
Apr 29 at 0:38
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柳青：滴滴每天面临向死而生的挑战 永远热泪盈眶 - 资讯 - 清泛网 - 专注C/...
...渗透，震人发聩：
柳青2016年滴滴年会演讲全文，无删节版(创业者共勉！)：
昨天还在跟Will聊说我今天讲什么，他说不用有压力，因为我今天会宣布年终奖和今天的抽奖，我说完了也没人在意你讲什么，讲什么都行。所以我现...
How to randomly pick an element from an array
...array[rnd];
}
Math.random() returns an double between 0.0 (inclusive) to 1.0 (exclusive)
Multiplying this with array.length gives you a double between 0.0 (inclusive) and array.length (exclusive)
Casting to int will round down giving you and integer between 0 (inclusive) and array.length-1 (inc...
Where can I find a list of scopes for Google's OAuth 2.0 API? [closed]
... under FAQ of GData developers. The Scopes doesn't changed in change OAuth 1.0 or Oauth 2.0. The Link to the Page is Added Click here to know the Full List of Google Scopes or link is https://developers.google.com/gdata/faq#AuthScopes
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serve current directory from command line
...g.
ruby -rsocket -e 's=TCPServer.new(5**5);loop{_=s.accept;_<<"HTTP/1.0 200 OK\r\n\r\n#{File.read(_.gets.split[1])rescue nil}";_.close}'
I found it here
Chris
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How to flip UIImage horizontally?
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There are two problems with this answer - scale isn't 1.0 at retina competible images and for some reason UIImageOrientationUp worked while UIImageOrientationUpMirrored didn't flip it. This worked - image = [UIImage imageWithCGImage:image.CGImage scale:image.scale orientation:UI...
How to align an image dead center with bootstrap
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An observation: In Bootstrap v3.1.0 it is possible to center img-responsive in column by adding text-center to column. This behavior is broken in v3.3.4. Very annoying. Css sucks.
– f470071
May 29 '15 at 9:37
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网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...、情况1：网址路径中包含汉字。
打开IE（我用的是8.0版），输入网址“http://zh.wikipedia.org/wiki/春节”。注意，“春节”这两个字此时是网址路径的一部分。
查看HTTP请求的头信息，会发现IE实际查询的网址是“http://zh.wikipedia....