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Explaining Apache ZooKeeper
... simple: The server team with 3 servers has the majority and is allowed to select the new leader.
Even if you just have 3 servers and one of them fails the other 2 still form the majority and can agree that one of them will become the new leader.
I realize once you think about it some time and un...
plupload图片上传插件的使用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...工作
multipart_params： 跟 multipart关联在一起的键值
multi_selection： 多选对话框
resize：修改图片属性 resize: {width: 320, height: 240, quality: 90}
runtimes:上传插件初始化选用那种方式的优先级顺序，如果第一个初始化失败就走第二个，依...
How to implement Enums in Ruby?
...a aren't interchangeable). There are many ways to itemize objects in Ruby; selecting the right one depends on the problem being solved. Slavishly replicating features you don't need is misguided. The correct answer has to depend on the context.
– user1164178
Fe...
The differences between .build, .create, and .create! and when should they be used?
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I'm selected this one as the most correct answer because of the mention on being able to link the associated models with them - that's an interesting and important difference I think over using .new and .save. Which takes a littl...
Throwing cats out of windows
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The problem with that report is selection bias - no one takes a dead cat to the vet.
– Niki Yoshiuchi
Oct 20 '10 at 15:28
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What is the “__v” field in Mongoose
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@diosney query.select('-__v'). @ExplosionPills you would need to add mongoose middleware like schema.pre('save', function (next) { this.increment(); next(); }).
– wprl
Dec 20 '13 at 19:02
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HashMap get/put complexity
...te information out of thin air. Having a data structure of n element I can select one element in n different way. With that, I can encode log(n) bit information. If I can encode that in zero bit (that is what O(1) means) then I created an infinitely compressing ZIP algorithm.
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GetProperties() to return all properties for an interface inheritance hierarchy
...(new Type[] { type })
.Concat(type.GetInterfaces())
.SelectMany(i => i.GetProperties());
}
share
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improve this answer
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follow
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Create UIActionSheet 'otherButtons' by passing in array, not varlist
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}
//display action sheet
actionSheet.showInView(self.view)
To get value selected, add delegate to your ViewController :
class MyViewController: UIViewController, UIActionSheetDelegate
And implement the method "clickedButtonAtIndex"
func actionSheet(actionSheet: UIActionSheet, clickedButtonAt...
Using an if statement to check if a div is empty
...SS:
.someDiv:empty {
display: none;
}
Unfortunately there is no CSS selector that selects the previous sibling element. There is only for the next sibling element: x ~ y
.someDiv:empty ~ .anotherDiv {
display: none;
}
Using jQuery
Checking text length of element with text() function
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