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What does the explicit keyword mean?
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The compiler is allowed to make one implicit conversion to resolve the parameters to a function. What this means is that the compiler can use constructors callable with a single parameter to convert from one type to another in order to get the right type fo...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
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Perl one-liner would be a simple version of Maxim's solution
perl -MList::Util=shuffle -e 'print shuffle(<STDIN>);' < myfile
share
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What columns generally make good indexes?
... to index it. The below is another example little different from the above one:
SELECT
buyers.buyer_id, /* no need to index */
country.name /* no need to index */
FROM buyers LEFT JOIN country
ON buyers.country_id=country.country_id /* consider to use index */
WHERE
first_name='Tariq' /* cons...
What is the difference between self-types and trait subclasses?
...rement to mix-in a User is satisfied. However, the second requirement mentioned above is not satisfied: the burden of implementing User still remains for classes/traits which extend Right.
With RightAgain both requirements are satisfied. A User and an implementation of User are provided.
For mor...
How to hash some string with sha256 in Java?
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SHA-256 isn't an "encoding" - it's a one-way hash.
You'd basically convert the string into bytes (e.g. using text.getBytes(StandardCharsets.UTF_8)) and then hash the bytes. Note that the result of the hash would also be arbitrary binary data, and if you want to...
NSRange to Range
...of replacingCharacters(in: NSRange, with: NSString) accepts an NSRange, so one simple solution is to convert String to NSString first. The delegate and replacement method names are slightly different in Swift 3 and 2, so depending on which Swift you're using:
Swift 3.0
func textField(_ textField: ...
Validate phone number with JavaScript
...this code in some website, and it works perfectly. It validates that the phone number is in one of these formats:
(123) 456-7890 or 123-456-7890
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How to display a list inline using Twitter's Bootstrap
... answered Dec 23 '12 at 0:48
coneybeareconeybeare
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How do you append an int to a string in C++? [duplicate]
...l kinds of objects to strings is through string streams. If you don't have one handy, just create one.
#include <sstream>
std::ostringstream oss;
oss << text << i;
std::cout << oss.str();
Alternatively, you can just convert the integer and append it to the string.
oss &l...
Properly removing an Integer from a List
... doesn't matter if n is an int or Integer, the method will always call the one you expect.
Using (Integer) n or Integer.valueOf(n) is more efficient than new Integer(n) as the first two can use the Integer cache, whereas the later will always create an object.
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