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How to understand nil vs. empty vs. blank in Ruby
...clear definition of the differences of nil? , blank? , and empty? in Ruby on Rails. Here's the closest I've come:
14 A...
Fundamental difference between Hashing and Encryption algorithms
... So instead, take the hash of the file, and store that (md5 would store 16 bytes instead of 3mb). That way, you just hash each file and compare to the stored database of hashes (This doesn't work as well in practice because of re-encoding, changing file headers, etc, but it's an example use-case).
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Difference between java.util.Random and java.security.SecureRandom
...his is a linear congruential pseudorandom number generator, as
defined by D. H. Lehmer and described by Donald E. Knuth in
The Art of Computer Programming, Volume 3:
Seminumerical Algorithms, section 3.2.1.
Predictability of Linear Congruential Generators
Hugo Krawczyk wrote a pretty ...
How to get a key in a JavaScript object by its value?
...
function getKeyByValue(object, value) {
return Object.keys(object).find(key => object[key] === value);
}
ES6, no prototype mutations or external libraries.
Example,
function getKeyByValue(object, value) {
return Object.keys(...
Scala vs. Groovy vs. Clojure [closed]
...think it is a language with limited utility, particularly as Jython and JRuby start making inroads on the JVM-land, compared to the others.
Clojure, even discounting some very interesting features, has a strong appeal just by being a Lisp dialect on JVM. It might limit its popularity, granted, but ...
gitignore all files of extension in directory
...
It would appear that the ** syntax is supported by git as of version 1.8.2.1 according to the documentation.
Two consecutive asterisks ("**") in patterns matched against full pathname may have special meaning:
A leading "**" followed by a slash means match in a...
Why does flowing off the end of a non-void function without returning a value not produce a compiler
Ever since I realized many years ago, that this doesn't produce an error by default (in GCC at least), I've always wondered why?
...
What does jquery $ actually return?
...r or not it has any contents is the question. Typically you can check this by using .val() (e.g. $('.myElem').val())
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MySQL COUNT DISTINCT
...ite
From cp_visits
Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY)
Group By site_id
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What is SaaS, PaaS and IaaS? With examples
...y belong to IaaS service model.
Although Hadoop is based on previous works by Google(GFS and MapReduce), it is not from Google. It is an Apache project. You can find more here. It is just a distributed computing platform and does not fall into any of these service models, IMHO.
Microsoft's Windows A...