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Simplest two-way encryption using PHP
...caiton
*
* @param string $masterKey (raw binary)
* @return array (two raw binary strings)
*/
protected static function splitKeys($masterKey)
{
// You really want to implement HKDF here instead!
return [
hash_hmac(self::HASH_ALGO, 'ENCRYPTION',...
What exactly do “IB” and “UB” mean?
...subtler things like pointer arithmetic that falls outside the bounds of an array object.
Another related term is 'unspecified behavior'. This is kind of between implementation defined and undefined behaviors. for unspecified behavior, the compiler must do something according to the standard, but ...
What is the Scala identifier “implicitly”?
...ow it is used in SeqLike#sorted. Implicit Parameters are also used to pass Array manifests, and CanBuildFrom instances.
Scala 2.8 allows a shorthand syntax for implicit parameters, called Context Bounds. Briefly, a method with a type parameter A that requires an implicit parameter of type M[A]:
de...
How can I reorder a list? [closed]
...
If you use numpy there's a neat way to do it:
items = np.array(["a","b","c","d"])
indices = np.arange(items.shape[0])
np.random.shuffle(indices)
print(indices)
print(items[indices])
This code returns:
[1 3 2 0]
['b' 'd' 'c' 'a']
...
What is the C runtime library?
...at runtime are implemented in the runtime library, e.g. some logic errors, array bounds checking, dynamic type checking, exception handling and possibly debugging functionality. For this reason, some programming bugs are not discovered until the program is tested in a "live" environment with real da...
Extracting substrings in Go
...
To get substring
find position of "sp"
cut string with array-logical
https://play.golang.org/p/0Redd_qiZM
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best way to get the key of a key/value javascript object
...", value) // baz
Object.keys() is javascript method which return an array of keys when using on objects.
Object.keys(obj) // ['bar']
Now you can iterate on the objects and can access values like below-
Object.keys(obj).forEach( function(key) {
console.log(obj[key]) // baz
})
...
Sorting rows in a data table
...help:
DataRow[] dataRows = table.Select().OrderBy(u => u["EmailId"]).ToArray();
Here, you can use other Lambda expression queries too.
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Detecting an undefined object property
...t for anything practical. Every context can override console.log, redefine Array prototype methods, and even override Function.prototype.call` hooking, and altering every time you call a function in JavaScript. Protecting against this is very paranoid and rather silly. Like I (and minitech) said, yo...
LINQ, Where() vs FindAll()
... to use enumerables rather than static collections (like Type<T> and Array<T>).
– Sebastian Job Bjørnager Jensen
May 14 '14 at 12:33
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