Tutorial by Examples: st

To uninstall Node.js on Windows, use Add or Remove Programs like this: Open Add or Remove Programs from the start menu. Search for Node.js. Windows 10: Click Node.js. Click Uninstall. Click the new Uninstall button. Windows 7-8.1: Click the Uninstall button under Node.js.

Everything in .NET is an object, hence every type has ToString() method defined in Object class which can be overridden. Default implementation of this method just returns the name of the type: public class Foo { } var foo = new Foo(); Console.WriteLine(foo); // outputs Foo ToString() is i...

Strings are immutable. You just cannot change existing string. Any operation on the string crates a new instance of the string having new value. It means that if you need to replace a single character in a very long string, memory will be allocated for a new value. string veryLongString = ... // m...

Despite String is a reference type == operator compares string values rather than references. As you may know string is just an array of characters. But if you think that strings equality check and comparison is made character by character, you are mistaken. This operation is culture specific (see ...

Say we are working on a class representing a Person by their first and last names. We have created a basic class to do this and implemented proper equals and hashCode methods. public class Person { private final String lastName; //invariant - nonnull private final String firstName; //in...

This example shows how Stopwatch can be used to benchmark a block of code. using System; using System.Diagnostics; public class Benchmark : IDisposable { private Stopwatch sw; public Benchmark() { sw = Stopwatch.StartNew(); } public voi...

Programming in general often requires a decision or a branch within the code to account for how the code operates under different inputs or conditions. Within the C# programming language (and most programming languages for this matter), the simplest and sometimes the most useful way of creating a br...

Following on from the If-Else Statement example, it is now time to introduce the Else If statement. The Else If statement follows directly after the If statement in the If-Else If-Else structure, but intrinsically has has a similar syntax as the If statement. It is used to add more branches to the c...

Installing the haystack package pip install django-haystack Configuration Add haystack to your project's INSTALLED_APPS inside of your settings.py file: # settings.py INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', # Put...

The option -v followed by an assignment of the form variable=value can be used to pass parameters to an awk program. This is illustrated by the punishment program below, whose job is to write count times the sentence “I shall not talk in class.” on standard output. The following example uses the v...

Custom events usually need custom event arguments containing information about the event. For example MouseEventArgs which is used by mouse events like MouseDown or MouseUp events, contains information about Location or Buttons which used to generate the event. When creating new events, to create a...

Download and install Visual Studio Community 2015 Open Visual Studio Community Click File -> New -> Project Click Templates -> Visual C++ -> Win32 Console Application and then name the project MyFirstProgram. Click Ok Click Next in the following window. Check the Empty proj...

Each Error object has a string property named stack that contains the stack trace:

Method 1 Gson gson = new Gson(); String json = "[ \"Adam\", \"John\", \"Mary\" ]"; Type type = new TypeToken<List<String>>(){}.getType(); List<String> members = gson.fromJson(json, type); Log.v("Members", members.toString());...

Implementing two-way-data-binding, to achieve the result from the previous example, could be done with two core functions: $digest is called after a user interaction (binding DOM=>variable) $watch sets a callback to be called after variable changes (binding variable=>DOM) note: this is ...

int[string] wordCount(string[] wordList) { int[string] words; foreach (word; wordList) { words[word]++; } return words; } void main() { int[string] count = wordCount(["hello", "world", "I", "say", "hello"]); ...

_.map is useful for changing a list into a different list in a purely declarative way. Rather than using imperative techniques like a while or for loop in javascript, you can just specify how you want to manipulate an element of a list and Use _.map to make a new list transformed by the functio...

Group common operations Docker builds images as a collection of layers. Each layer can only add data, even if this data says that a file has been deleted. Every instruction creates a new layer. For example: RUN apt-get -qq update RUN apt-get -qq install some-package Has a couple of downsides: ...

It is possible to save a Docker container's filesystem contents to a tarball archive file. This is useful in a pinch for moving container filesystems to different hosts, for example if a database container has important changes and it isn't otherwise possible to replicate those changes elsewhere. Pl...

3.0 The most simple way is to use sorted(): let words = ["Hello", "Bonjour", "Salute", "Ahola"] let sortedWords = words.sorted() print(sortedWords) // ["Ahola", "Bonjour", "Hello", "Salute"] or sort() var mutable...