Cryptography is something very hard and after spending a lot of time reading different examples and seeing how easy it is to introduce some form of vulnerability I found an answer originally written by @jbtule that I think is very good. Enjoy reading:
"The general best practice for symmetric e...
Autocommand groups are good for organization but they can be useful for debugging too. Think of them as small namespaces that you can enable/disable at will.
Example
augroup MyGroup
" Clear the autocmds of the current group to prevent them from piling
" up each time you rel...
By default the built-in Request Localization middleware only supports setting culture via query, cookie or Accept-Language header. This example shows how create a middleware which allows to set the culture as part of the path like in /api/en-US/products.
This example middleware assumes the locale t...
In addition to functional constructs such as Try, Option and Either for error handling, Scala also supports a syntax similar to Java's, using a try-catch clause (with a potential finally block as well). The catch clause is a pattern match:
try {
// ... might throw exception
} catch {
case i...
This code compiles:
Integer arg = null;
int x = arg;
But it will crash at runtime with a java.lang.NullPointerException on the second line.
The problem is that a primitive int cannot have a null value.
This is a minimalistic example,
but in practice it often manifests in more sophisticated f...
Dim sites() As String = {"Stack Overflow",
"Super User",
"Ask Ubuntu",
"Hardware Recommendations"}
Dim query = From x In sites Select x.Length
' result = 14, 10, 10, 24
Query...
Thread.sleep causes the current thread to suspend execution for a specified period. This is an efficient means of making processor time available to the other threads of an application or other applications that might be running on a computer system. There are two overloaded sleep methods in the Thr...
To get a value in NSUserDefaults you can use the following functions:
Swift
arrayForKey(_:)
boolForKey(_:)
dataForKey(_:)
dictionaryForKey(_:)
floatForKey(_:)
integerForKey(_:)
objectForKey(_:)
stringArrayForKey(_:)
stringForKey(_:)
doubleForKey(_:)
URLForKey(_:)
Objective-C
-(nullab...
There are use cases when you might want to rename your app directory to something else. In Laravel4 you could just change a config entry, here's one way to do it in Laravel5.
In this example we'll be renaming the app directory to src.
Override Application class
The directories name app is hardcod...
A HAVING clause filters the results of a GROUP BY expression. Note: The following examples are using the Library example database.
Examples:
Return all authors that wrote more than one book (live example).
SELECT
a.Id,
a.Name,
COUNT(*) BooksWritten
FROM BooksAuthors ba
INNER JOIN Aut...
We can use 1,2,3.. to determine the type of order:
SELECT * FROM DEPT
ORDER BY
CASE DEPARTMENT
WHEN 'MARKETING' THEN 1
WHEN 'SALES' THEN 2
WHEN 'RESEARCH' THEN 3
WHEN 'INNOVATION' THEN 4
ELSE 5
END,
CITY
IDREGIONCITYDEPARTMENTEMPLOYEES_N...
The method Kernel#autoload registers filename to be loaded (using Kernel::require) the first time that module (which may be a String or a symbol) is accessed.
autoload :MyModule, '/usr/local/lib/modules/my_module.rb'
The method Kernel#autoload? returns filename to be loaded if name is registere...
To get records having any of the given ids
select *
from products
where id in (1,8,3)
The query above is equal to
select *
from products
where id = 1
or id = 8
or id = 3
Guard clauses enables us to check the arguments before executing the function. Guard clauses are usually preferred to if and cond due to their readability, and to make a certain optimization technique easier for the compiler. The first function definition where all guards match is executed.
Here is...
You can pass default parameters to any named function using the syntax: param \\ value:
defmodule Example do
def func(p1, p2 \\ 2) do
IO.inspect [p1, p2]
end
end
Example.func("a") # => ["a", 2]
Example.func("b", 4) # => ["b", ...
Autoboxing can come at a substantial memory overhead. For example:
Map<Integer, Integer> square = new HashMap<Integer, Integer>();
for(int i = 256; i < 1024; i++) {
square.put(i, i * i); // Autoboxing of large integers
}
will typically consume substantial amount of memory (...
If you've got multiple implementations of the same interface, Spring can autowire them all into a collection object. I'm going to use an example using a Validator pattern1
Foo Class:
public class Foo {
private String name;
private String emailAddress;
private String errorMessage;...
For bezier path to get resized based on the view frame, override the drawRect of view that you are drawing the bezier path :
- (void)drawRect:(CGRect)frame
{
UIBezierPath* rectanglePath = [UIBezierPath bezierPathWithRect: CGRectMake(CGRectGetMinX(frame), CGRectGetMinY(frame), CGRectGetWidth(f...
