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How do I implement a callback in PHP?
...n pointer, referencing a function or class method for future invocation. This has allowed some elements of functional programming since PHP 4. The flavors are:
$cb1 = 'someGlobalFunction';
$cb2 = ['ClassName', 'someStaticMethod'];
$cb3 = [$object, 'somePublicMethod'];
// this syntax is callable si...
Can you determine if Chrome is in incognito mode via a script?
Is it possible to determine if Google Chrome is in incognito mode via a script?
10 Answers
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Define global variable in a JavaScript function
Is it possible to define a global variable in a JavaScript function?
13 Answers
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difference between foldLeft and reduceLeft in Scala
...'s rather about the difference between reducing and folding
The difference is not the implementation at all, just look at the signatures.
The question doesn't have anything to do with Scala in particular, it's rather about the two concepts of functional programming.
Back to your question:
Here is...
Why do enum permissions often have 0, 1, 2, 4 values?
...
Because they are powers of two and I can do this:
var permissions = Permissions.Read | Permissions.Write;
And perhaps later...
if( (permissions & Permissions.Write) == Permissions.Write )
{
// we have write access
}
It is a bit field, where each set bit cor...
Using the star sign in grep
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The asterisk is just a repetition operator, but you need to tell it what you repeat. /*abc*/ matches a string containing ab and zero or more c's (because the second * is on the c; the first is meaningless because there's nothing for i...
Difference between FetchType LAZY and EAGER in Java Persistence API?
I am a newbie to Java Persistence API and Hibernate.
15 Answers
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Python unittest - opposite of assertRaises?
I want to write a test to establish that an Exception is not raised in a given circumstance.
10 Answers
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Best approach to remove time part of datetime in SQL Server
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Strictly, method a is the least resource intensive:
a) select DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0)
Proven less CPU intensive for same total duration a million rows by some one with way too much time on their hands: Most efficient way i...
JavaScript: client-side vs. server-side validation
Which is better to do client side or server side validation?
13 Answers
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