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Idiomatic way to wait for multiple callbacks in Node.js
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Promises
The Promise object is used for deferred and asynchronous computations.
A Promise represents an operation that hasn't completed yet, but is
expected in the future.
A popular promises library is bluebird. A would advise to have a look at why promises.
You should use promise...
Check if table exists and if it doesn't exist, create it in SQL Server 2008
... plan) using an indexed field instead of * (object_id is the numeric field commonly refered to in this table) use type = 'U' instead of type in (N'U') (the column _type is of type char using Nchar causes an implicit conversion which often causes issues with the cardinality estimator) if (not exists ...
Swapping two variable value without using third variable
... 0011
//So *x is 0011
Should this be used?
In general cases, no. The compiler will optimize away the temporary variable and given that swapping is a common procedure it should output the optimum machine code for your platform.
Take for example this quick test program written in C.
#include &...
Efficient way to return a std::vector in c++
...ll be moved on return and in some cases even the move can be elided by the compiler.
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What is the difference between dynamic and static polymorphism in Java?
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Polymorphism
1. Static binding/Compile-Time binding/Early binding/Method overloading.(in same class)
2. Dynamic binding/Run-Time binding/Late binding/Method overriding.(in different classes)
overloading example:
class Calculation {
void sum(int a,in...
What is “vectorization”?
...ogether and just describe operating on arrays instead of the elements that comprise them)
The difference between vectorization and loop unrolling:
Consider the following very simple loop that adds the elements of two arrays and stores the results to a third array.
for (int i=0; i<16; ++i)
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Maven2 property that indicates the parent directory
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Why does C# disallow readonly local variables?
...All it would mean is the variable only has one assignment in the method at compile time.
– Sam Harwell
Sep 3 '09 at 2:06
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Can't push to GitHub because of large file which I already deleted
...f that file. The problem is that the file is present in the history.
This command changes the hashes of your commits which can be a real problem, especially on shared repositories. It should not be performed without understanding the consequences.
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