Tutorial by Examples: s

The fastest way to get Ruby on your Windows computer is to use Ruby Installer. It's a single-click installer that will get everything set up for you super fast. After installing Ruby, follow the instructions below to install Sass: Open CMD Run gem install sass If you get an error message, try s...

File streams are buffered by default, as are many other types of streams. This means that writes to the stream may not cause the underlying file to change immediately. In oder to force all buffered writes to take place immediately, you can flush the stream. You can do this either directly by invokin...

dotimes is a macro for integer iteration over a single variable from 0 below some parameter value. One of the simples examples would be: CL-USER> (dotimes (i 5) (print i)) 0 1 2 3 4 NIL Note that NIL is the returned value, since we did not provide one ourselves; the v...

dolist is a looping macro created to easily loop through the lists. One of the simplest uses would be: CL-USER> (dolist (item '(a b c d)) (print item)) A B C D NIL ; returned value is NIL Note that since we did not provide return value, NIL is returned (and A,B,C,D are ...

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...

Installation The preferred way to install Mockito is to declare a dependency on mockito-core with a build system of choice. As of July 22nd, 2016, the latest non-beta version is 1.10.19, but 2.x is already encouraged to be migrated to. Maven <dependency> <groupId>org.mockito</...

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...

Attributes are name-value pairs associated with an element. They are represented by values in single or double quotes inside the opening element tag, or the empty element tag if it is an empty element. <document> <anElement foo="bar" abc='xyz'><!-- some content -->&l...

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 ...

List doesn't support "random access", which means it takes more work to get, say, the fifth element from the list than the first element, and as a result there's no List.get nth list function. One has to go all the way from the beginning (1 -> 2 -> 3 -> 4 -> 5). If you need ra...

Packages are bundles of classes. Every class must be declared within a package using the package statement. The package statement is followed by the name of your package, or followed by nothing in the case of adding classes to the top-level package. Sub-packages are created using dot (.) delimitatio...

Arrays can have more than one dimension. The following example creates a two-dimensional array of ten rows and ten columns: int[,] arr = new int[10, 10]; An array of three dimensions: int[,,] arr = new int[10, 10, 10]; You can also initialize the array upon declaration: int[,] arr = new int...

Import the numpy module to use any part of it. import numpy as np Most examples will use np as shorthand for numpy. Assume "np" means "numpy" in code examples. x = np.array([1,2,3,4])

This makes image masked to the shape of the letters of the label: Objective-C self.maskImage.layer.mask = self.maskLabel.layer; self.maskImage.layer.masksToBounds = YES; Swift 3 maskImageView.mask = maskLabel maskImageView.masksToBounds = true Here is the result:

A comment is marked by an apostrophe ('), and ignored when the code executes. Comments help explain your code to future readers, including yourself. Since all lines starting with a comment are ignored, they can also be used to prevent code from executing (while you debug or refactor). Placing an ap...

Sub RemComments() Rem Comments start with "Rem" (VBA will change any alternate casing to "Rem") Rem is an abbreviation of Remark, and similar to DOS syntax Rem Is a legacy approach to adding comments, and apostrophes should be preferred Rem Comments CANNOT appear af...

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}",...