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Why is require_once so bad to use?
...call means checking that log. So there's definitely some extra work being done there but enough to detriment the speed of the whole app?
... I really doubt it... Not unless you're on really old hardware or doing it a lot.
If you are doing thousands of *_once, you could do the work yourself in a l...
Anyone else find naming classes and methods one of the most difficult parts in programming? [closed]
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One lesson I have learned, is that if you can't find a name for a class, there is almost always something wrong with that class:
you don't need it
it does too much
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Worst security hole you've seen? [closed]
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Jeff Bezos mentioned that in the very early days of Amazon, you could have a negative quantity of books and Amazon would credit your account (and presumably wait for you to ship it to them). See 0:47 at youtube.com/watch?v=-hxX_Q5CnaA
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Array.Copy vs Buffer.BlockCopy
.... I should note that both methods are roughly 3x faster than using Array.Clone(), and maybe 20x faster than copying it in a for loop.
– Ken Smith
Sep 20 '11 at 22:12
3
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MongoDB/NoSQL: Keeping Document Change History
... fairly common requirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can writ...
Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
...React: Rethinking best practices -- JSConf EU 2013 ) and the speaker mentioned that dirty-checking of the model can be slow. But isn't calculating the diff between virtual DOMs actually even less performant since the virtual DOM, in most of the cases, should be bigger than model?
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Event listener for when element becomes visible?
...to a page. the div it is going to be included in will default to display:none . Is there a way i can put an event listener on my toolbar to listen for when it becomes visible so it can initialize? or will I have to pass it a variable from the containing page?
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What is the difference between currying and partial application?
...re of lambda(z){z(x(y))} with passed-in the values of x and y to f(x,y).
One way to use partial application is to define functions as partial applications of generalized functions, like fold:
function fold(combineFunction, accumulator, list) {/* ... */}
function sum = curry(fold)(lambda(accum...
Transpose list of lists
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One way to do it is with NumPy transpose. For a list, a:
>>> import numpy as np
>>> np.array(a).T.tolist()
[[1, 4, 7], [2, 5, 8], [3, 6, 9]]
Or another one without zip:
>>> map(list,map(None,*a))
[...
How do I view the full content of a text or varchar(MAX) column in SQL Server 2008 Management Studio
...r XML data. This is not the default and needs to be set in the options.
One trick which might work in quite limited circumstances is simply naming the column in a special manner as below so it gets treated as XML data.
DECLARE @S varchar(max) = 'A'
SET @S = REPLICATE(@S,100000) + 'B'
SELECT ...