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How to get the first non-null value in Java?
... this requires every argument to be precalculated before the call to coalesce, pointless for performance reasons
– Ivan G.
Jun 20 '13 at 9:07
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Does return stop a loop?
...t of true. return still returns from the current iteration of the function callback, in its own scope, but would not be expected to break from the entire calling method forEach(). So it isn't returning from the loop itself, but it is returning from the callback the loop executes. In the code exampl...
Aren't promises just callbacks?
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Promises are not callbacks. A promise represents the future result of an asynchronous operation. Of course, writing them the way you do, you get little benefit. But if you write them the way they are meant to be used, you can write asynchrono...
Is it better to call ToList() or ToArray() in LINQ queries?
... this to be the rarer case. It's much more common to see a lot of ToArray calls which are immediately passed to other short lived uses of memory in which case ToList is demonstrably better.
The key here is to profile, profile and then profile some more.
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Add column to SQL Server
...le
ALTER TABLE [table]
ADD Column1 Datatype
E.g
ALTER TABLE [test]
ADD ID Int
If User wants to make it auto incremented then
ALTER TABLE [test]
ADD ID Int IDENTITY(1,1) NOT NULL
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Unbalanced calls to begin/end appearance transitions for
...y view controller on behalf of the view controller. You can still keep any callback delegates to the real view controller, but you must have the tab bar controller present and dismiss.
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What is aspect-oriented programming?
... with AOP you can leave that stuff out of the main code and define it vertically like so:
function mainProgram()
{
var x = foo();
doSomethingWith(x);
return x;
}
aspect logging
{
before (mainProgram is called):
{
log.Write("entering mainProgram");
}
after (main...
What is std::promise?
...y allow you to return a single result, to return several you would need to call async several times, which might waste resources.
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How to do the equivalent of pass by reference for primitives in Java
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return toyNumber
}
This choice would require a small change to the callsite in main so that it reads, toyNumber = temp.play(toyNumber);.
Choice 3: make it a class or static variable
If the two functions are methods on the same class or class instance, you could convert toyNumber into a cla...
micro:bit 微控制器教程 · App Inventor 2 中文网
...转
// 按钮按下时发送指令
when Button_Forward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "F\n"
when Button_Backward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "B\n"
// 按钮释放时停止
when anyButton.TouchUp
do
call BluetoothLE1.WriteRXCharacteristic...