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When should I use a composite index?
...re using queries that benefit from it. A composite index that looks like this:
index( column_A, column_B, column_C )
will benefit a query that uses those fields for joining, filtering, and sometimes selecting. It will also benefit queries that use left-most subsets of columns in that composite. S...
Do I need dependency injection in NodeJS, or how to deal with …?
...r or property injection. Although you still can.
The great thing about JS is that you can modify just about anything to achieve what you want. This comes in handy when it comes to testing.
Behold my very lame contrived example.
MyClass.js:
var fs = require('fs');
MyClass.prototype.errorFileExis...
How do I enumerate the properties of a JavaScript object? [duplicate]
...
Simple enough:
for(var propertyName in myObject) {
// propertyName is what you want
// you can get the value like this: myObject[propertyName]
}
Now, you will not get private variables this way because they are not available.
EDIT: @bitwiseplatypus is correct that unless you use the ...
Can I make git recognize a UTF-16 file as text?
... change git identified the file as binary and wouldn't diff it for me. I discovered that the file was encoded in UTF-16.
8...
Compelling examples of custom C++ allocators?
...t;T>
to
std::vector<T,tbb::scalable_allocator<T> >
(this is a quick and convenient way of switching the allocator to use TBB's nifty thread-private heaps; see page 7 in this document)
share
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Why java.util.Optional is not Serializable, how to serialize the object with such fields
The Enum class is Serializable so there is no problem to serialize object with enums. The other case is where class has fields of java.util.Optional class. In this case the following exception is thrown: java.io.NotSerializableException: java.util.Optional
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How do I get whole and fractional parts from double in JSP/Java?
...do I get whole and fractional parts from double in JSP/Java ? If the value is 3.25 then I want to get fractional =.25 , whole = 3
...
Generate an integer that is not among four billion given ones
I have been given this interview question:
38 Answers
38
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What are the applications of binary trees?
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To squabble about the performance of binary-trees is meaningless - they are not a data structure, but a family of data structures, all with different performance characteristics. While it is true that unbalanced binary trees perform much worse than self-balancing binary tre...
grep exclude multiple strings
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Two examples of filtering out multiple lines with grep:
Put this in filename.txt:
abc
def
ghi
jkl
grep command using -E option with a pipe between tokens in a string:
grep -Ev 'def|jkl' filename.txt
prints:
abc
ghi
Command using -v option with pipe between tokens surrounded by ...