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Why is String immutable in Java?
...wo objects have same value (a="test", and b="test") and thus you need only one string object (for both a and b, these two will point to the same object).
Class loading: String is used as arguments for class loading. If mutable, it could result in wrong class being loaded (because mutable objects cha...
Which is more preferable to use: lambda functions or nested functions ('def')?
... a def, just to be more readable. If the function is more complex than the ones at operator module, a def is probably better.
So, real world good lambda use cases are very rare.
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What is the purpose of the reader monad?
...ur program, but from the time it gets compiled! So what do you do? Well, one option would be to use the Reader monad:
computePrice :: Reader CurrencyDict Dollars
computePrice
= do currencyDict <- ask
--insert computation here
Perhaps the most classic use-case is in implementing i...
Measuring elapsed time with the Time module
...age:
@profile
def your_function(...):
...
You can profile more then one function simultaneously. Then to print measurements just call the print_prof_data():
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How can I sharpen an image in OpenCV?
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One general procedure is laid out in the Wikipedia article on unsharp masking:
You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area ...
MySQL select one column DISTINCT, with corresponding other columns
...lts every time you would execute the query. But i would be sure whether anyone should use undocumented features in production environment.
– Arunas Junevicius
Jun 3 '13 at 14:54
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When to use Storyboard and when to use XIBs
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Storyboards make working in a team harder: Because you usually only have one huge storyboard file for your project, having multiple developers regularly making changes to that one file can be a headache: Changes need to be merged and conflicts resolved. When a conflict occurs, it is hard to tell h...
What is the difference between @Inject and @Autowired in Spring Framework? Which one to use under wh
I am going through some blogs on SpringSource and in one of the blogs, author is using @Inject and I suppose he can also use @Autowired .
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MySQL ON vs USING?
...t a couple differences are noteworthy:
ON is the more general of the two. One can join tables ON a column, a set of columns and even a condition. For example:
SELECT * FROM world.City JOIN world.Country ON (City.CountryCode = Country.Code) WHERE ...
USING is useful when both tables share a colum...
What Java ORM do you prefer, and why? [closed]
...oo many to be managed efficiently and there are behaviors that could drive one crazy. On the other hand i have support for major databases and never have to worry about their differences.
– marcolopes
Mar 5 '11 at 13:03
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