The Iterator.remove() method is an optional method that removes the element returned by the previous call to Iterator.next(). For example, the following code populates a list of strings and then removes all of the empty strings.
List<String> names = new ArrayList<>();
names.add("...
Function application syntax in Elm does not use parenthesis or commas, and is instead whitespace-sensitive.
To define a function, specify its name multiplyByTwo and arguments x, any operations after equal sign = is what returned from a function.
multiplyByTwo x =
x * 2
To call a function, ...
It is very convenient to use extension methods with interfaces as implementation can be stored outside of class and all it takes to add some functionality to class is to decorate class with interface.
public interface IInterface
{
string Do()
}
public static class ExtensionMethods{
pu...
List employees earning more than $50000 born this century. List their name, date of birth and salary, sorted alphabetically by name.
SELECT employee_name, date_of_birth, salary
FROM employees
WHERE salary > 50000
AND date_of_birth >= DATE '2000-01-01'
ORDER BY employee_name;
Show...
In [1]: df1 = pd.DataFrame({'x': [1, 2, 3], 'y': ['a', 'b', 'c']})
In [2]: df2 = pd.DataFrame({'y': ['b', 'c', 'd'], 'z': [4, 5, 6]})
In [3]: df1
Out[3]:
x y
0 1 a
1 2 b
2 3 c
In [4]: df2
Out[4]:
y z
0 b 4
1 c 5
2 d 6
Inner join:
Uses the intersection ...
When you inherit from a class with a property, you can provide a new implementation for one or more of the property getter, setter or deleter functions, by referencing the property object on the parent class:
class BaseClass(object):
@property
def foo(self):
return some_calculate...
The following example listens to window.onerror event and uses an image beacon technique to send the information through the GET parameters of an URL.
var hasLoggedOnce = false;
// Some browsers (at least Firefox) don't report line and column numbers
// when event is handled through window.addE...
we can annotate fields with @BindView and a view ID for Butter Knife to find and automatically cast the corresponding view in our layout.
Binding Views
Binding Views in Activity
class ExampleActivity extends Activity {
@BindView(R.id.title) TextView title;
@BindView(R.id.subtitle) TextView ...
Usually authentication&authorization processes are performed by built-in cookie and token supports in .net MVC. But if you decide to do it yourself with Session you can use below logic for both page requests and ajax requests.
public class SessionControl : ActionFilterAttribute
{
public o...
This is an example of how to use the generic type TFood inside Eat method on the class Animal
public interface IFood
{
void EatenBy(Animal animal);
}
public class Grass: IFood
{
public void EatenBy(Animal animal)
{
Console.WriteLine("Grass was eaten by: {0}",...
Along with classic way of route definition MVC WEB API 2 and then MVC 5 frameworks introduced Attribute routing:
public class RouteConfig
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
// This...
Draw samples from a normal (gaussian) distribution
# Generate 5 random numbers from a standard normal distribution
# (mean = 0, standard deviation = 1)
np.random.randn(5)
# Out: array([-0.84423086, 0.70564081, -0.39878617, -0.82719653, -0.4157447 ])
# This result can also be achieved with t...
.htaccess can be used to set a custom error pages that matches the theme of your website instead of seeing a white error page with black techno-babble when users end up on at a page with an error server response code. The error page can be any browser parseable file, including (But not limited to)...
The following method computes the Nth Fibonacci number using recursion.
public int fib(final int n) {
if (n > 2) {
return fib(n - 2) + fib(n - 1);
}
return 1;
}
The method implements a base case (n <= 2) and a recursive case (n>2). This illustrates the use of re...
Overload resolution partitions the cost of passing an argument to a parameter into one of four different categorizes, called "sequences". Each sequence may include zero, one or several conversions
Standard conversion sequence
void f(int a); f(42);
User defined conversion seque...
By recursion
let rec sumTotal list =
match list with
| [] -> 0 // empty list -> return 0
| head :: tail -> head + sumTotal tail
The above example says: "Look at the list, is it empty? return 0. Otherwise it is a non-empty list. So it could be [1], [1; 2], [1; 2; 3] ...
You can open several content managers at the same time:
with open(input_path) as input_file, open(output_path, 'w') as output_file:
# do something with both files.
# e.g. copy the contents of input_file into output_file
for line in input_file:
output_file.write(line...
