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convert a list of objects from one type to another using lambda expression
...w List<Type1>();
var list2 = new List<Type2>();
list1.ForEach(item => list2.Add(new Type2() { Prop1 = value1 }));
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jquery selector for id starts with specific text [duplicate]
...e, such as href, name, id or src.
Solution 2
Use classes
// Matches all items that have the class 'classname'
$(".className");
// Matches all divs that have the class 'classname'
$("div.className");
Solution 3
List them (also noted in previous answers)
$("#id1,#id2,#id3");
Solution 4
For ...
How to make the first option of selected with jQuery
... This will not work in cases where a drop down has a pre-selected item. See my comments on the selected answer for details.
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Find files and tar them (with spaces)
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My full code will back up only items that are modified in the past day. Since its a daily back up I don't want to have repeated information to save on file size (I also have a full back up every 15 days).
– Caleb Kester
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What's the Linq to SQL equivalent to TOP or LIMIT/OFFSET?
... OP actually mentioned offset as well, so for ex. if you'd like to get the items from 30 to 60, you would do:
var foo = (From t In MyTable
Select t.Foo).Skip(30).Take(30);
Use the "Skip" method for offset.
Use the "Take" method for limit.
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Checking if a variable is defined?
...ned? keyword (documentation). It will return a String with the kind of the item, or nil if it doesn’t exist.
>> a = 1
=> 1
>> defined? a
=> "local-variable"
>> defined? b
=> nil
>> defined? nil
=> "nil"
>> defined? String
=> "constant"
>> de...
Android代码优化小技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...copy实现的9倍多。
Tip: Also see Josh Bloch’s Effective Java, item 47.
谨慎使用native函数
当你需要把已经存在的native code迁移到Android，请谨慎使用JNI。如果你要使用JNI,请学习JNI Tips
关于性能的误区
在没有做JIT之前，使用一种确切的...
Cost of len() function
...d.
List:
$ python -m timeit -s "l = range(10);" "len(l)"
10000000 loops, best of 3: 0.0677 usec per loop
$ python -m timeit -s "l = range(1000000);" "len(l)"
10000000 loops, best of 3: 0.0688 usec per loop
Tuple:
$ python -m timeit -s "t = (1,)*10;" "len(t)"
10000000 loops, best of 3: 0.0712 u...
Convert array of strings into a string in Java
...cause you're creating and throwing away as many string objects as you have items in your array. For small arrays you might not really notice the difference, but for large ones it can be orders of magnitude slower.
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How to create a Menubar application for Mac
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NSStatusItem is what you are looking for. Also add LSUIElement with string value of 1 to your Info.plist to hide it from Dock.
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