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Abusing the algebra of algebraic data types - why does this work?
... automatically and my less-than-subtle choice of names should give you the idea. The (&&&) operator is defined in Control.Arrow, by the way.
The dual of the above is the coproduct A+B with injections inl : A → A+B and inr : B → A+B, where given any type C and functions f : A → C, g...
If string is empty then return some default value
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Phrogz sort of gave me the idea in PofMagicfingers comment, but what about overriding | instead?
class String
def |(what)
self.strip.blank? ? what : self
end
end
@user.address | "We don't know user's address"
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How do cache lines work?
...e cache memory areas renders the CPU defect as a whole).
To give a timing idea (source: costs to access caches and memory)
L1 cache: 1ns to 2ns (2-4 cycles)
L2 cache: 3ns to 5ns (6-10 cycles)
L3 cache: 12ns to 20ns (24-40 cycles)
RAM: 60ns (120 cycles)
Since we mix different CPU types these ar...
Why does Java allow us to compile a class with a name different than the file name?
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@AndrewBarber, the analogy perfectly fits the idea of directory, in the long corridor you can quickly find a person by just glancing on the door plates, you do not need to enter each room and ask.
– exebook
Dec 2 '13 at 15:15
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PHP and MySQL - how to avoid password in source code? [duplicate]
...'s worse than having it in your source code.
It's also going to be a good idea to have a base (empty / default) version of the configuration file, and separate it out per environments, so that you could have a different configuration file for production, development, and testing platforms.
An envi...
What is the fastest way to compare two sets in Java?
...on, there is an approach that can improve the "almost the same" case.
The idea is that you need to pre-calculate and cache a hash for the entire set so that you could get the set's current hashcode value in O(1). Then you can compare the hashcode for the two sets as an acceleration.
How could y...
A simple explanation of Naive Bayes Classification
...and it takes comparisons by times occurred as a probability, but I have no idea how the training data is related to the actual dataset.
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How to highlight text using javascript
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Using a simple "replace" is a bad idea. I've described why here: stackoverflow.com/a/32758672/3894981
– dude
Sep 24 '15 at 10:43
2
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Can you provide some examples of why it is hard to parse XML and HTML with a regex? [closed]
...therefore: not only is parsing XML with regexps hard, but it is also a bad idea. Just use one of the millions of existing XML parsers, and take advantage of all the advanced features of XML.
HTML is just too hard to even try parsing on your own. First the legal syntax has many little subtleties th...
Errors: “INSERT EXEC statement cannot be nested.” and “Cannot use the ROLLBACK statement within an I
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do you have any idea what the technical reason is for not allowing it? I can't find any info on this.
– jtate
Feb 15 '19 at 21:29
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