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What is the dependency inversion principle and why is it important?
...face that represents the concept of logging, this interface should be much more stable in time than its implementation, and call sites should be much less affected by changes you could make while maintaining or extending that logging mechanism.
By also making the implementation depend on an interfa...
T-SQL Cast versus Convert
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CONVERT is SQL Server specific, CAST is ANSI.
CONVERT is more flexible in that you can format dates etc. Other than that, they are pretty much the same. If you don't care about the extended features, use CAST.
EDIT:
As noted by @beruic and @C-F in the comments below, there is pos...
Regular Expressions: Is there an AND operator?
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Count number of records returned by group by
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Maintain the aspect ratio of a div with CSS
...lute;
top: 0; bottom: 0; left: 0; right: 0;
}
Here's a demo and another more in depth demo
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How can I position my div at the bottom of its container?
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Initialization of an ArrayList in one line
... it will initialize an immutable List rather than an ArrayList, and furthermore, it's not available yet, if it ever will be.
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How to check if PHP array is associative or sequential?
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I think it is more useful to think of sequential arrays as a special case of associative arrays. So every array is associative, but only some are sequential. Therefore, a function isSequential() would make more sense than isAssoc(). In suc...
When should we use Observer and Observable?
...g is the Observable.
The analogy might not be perfect, because Twitter is more likely to be a Mediator. But it illustrates the point.
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Get number of digits with JavaScript
...known behaviour of floating point math, so cast-to-string approach will be more easy and fool proof. As mentioned by @streetlogics fast casting can be done with simple number to string concatenation, leading the replace solution to be transformed to:
var length = (number + '').replace('.', '').leng...