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This example is a quick setup of Angular 2 and how to generate a quick example project. Prerequisites: Node.js v4 or greater. npm v3 or greater or yarn. Open a terminal and run the commands one by one: npm install -g @angular/cli or yarn global add @angular/cli depending on your choi...

Simple: NSString *newString = @"My String"; From multiple strings: NSString *stringOne = @"Hello"; NSString *stringTwo = @"world"; NSString *newString = [NSString stringWithFormat:@"My message: %@ %@", stringOne, stringTwo]; Usi...

The main difference is that double-quoted String literals support string interpolations and the full set of escape sequences. For instance, they can include arbitrary Ruby expressions via interpolation: # Single-quoted strings don't support interpolation puts 'Now is #{Time.now}' # Now is #{Time...

Ruby provides several ways to create a String object. The most common way is using single or double quotes to create a "string literal": s1 = 'Hello' s2 = "Hello" The main difference is that double-quoted string literals are a little bit more flexible as they support interpo...

Concatenate strings with the + operator: s1 = "Hello" s2 = " " s3 = "World" puts s1 + s2 + s3 # => Hello World s = s1 + s2 + s3 puts s # => Hello World Or with the << operator: s = 'Hello' s << ' ' s << 'World' puts s # => ...

The double-quoted delimiter " and %Q sequence supports string interpolation using #{ruby_expression}: puts "Now is #{Time.now}" # Now is Now is 2016-07-21 12:47:45 +0200 puts %Q(Now is #{Time.now}) # Now is Now is 2016-07-21 12:47:45 +0200

By default, all the required libraries for build ASP.NET applications are included during the installation of Visual Studio. If a newer version of ASP.NET is released that was not included with Visual Studio, you can download the appropriate SDK library from Microsoft, which will include all the nec...

Few people have issue regarding error message not displaying if existing value is being entered in textbox. So, For Example I'm not allowing user to enter existing email. signup.php (Page where you wanted to sign up new user without existing email id) Remove use yii\bootstrap\ActiveForm; (if p...

You can iterate over arrays either by using enhanced for loop (aka foreach) or by using array indices: int[] array = new int[10]; // using indices: read and write for (int i = 0; i < array.length; i++) { array[i] = i; } Java SE 5 // extended for: read only for (int e : array) { ...

5 The <input type="email"> is used for input fields that should contain an e-mail address. <form> <label>E-mail: <label> <input type="email" name="email"> </form> E-mail address can be automatically validated when submitte...

Tuples are created using generic types Tuple<T1>-Tuple<T1,T2,T3,T4,T5,T6,T7,T8>. Each of the types represents a tuple containing 1 to 8 elements. Elements can be of different types. // tuple with 4 elements var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, t...

To access tuple elements use Item1-Item8 properties. Only the properties with index number less or equal to tuple size are going to be available (i.e. one cannot access Item3 property in Tuple<T1,T2>). var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, true, new MyC...

Some people have issues regarding error messages not being displayed if an existing value is being entered. For example I'm not allowing a user signup with an existing email. View <?php ...................... <?= $form->field($modelUser, 'email')->textInput(['class'=&gt...

Lets assume you have a class called Person with just name private class Person { public String name; public Person(String name) { this.name = name; } } Code: Gson g = new Gson(); Person person = new Person("John"); System.out.println(g.toJson(person)); /...

Lets assume you have a class called Person with just name private class Person { public String name; public Person(String name) { this.name = name; } } Code: Gson gson = new Gson(); String json = "{\"name\": \"John\"}"; Person person ...

String json = "{\"name\": \"John\", \"age\":21}"; JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject(); System.out.println(jsonObject.get("name").getAsString()); //John System.out.println(jsonObject.get("age").getAs...

In Python 2, range function returns a list while xrange creates a special xrange object, which is an immutable sequence, which unlike other built-in sequence types, doesn't support slicing and has neither index nor count methods: Python 2.x2.3 print(range(1, 10)) # Out: [1, 2, 3, 4, 5, 6, 7, 8, 9...

With any variadic function, the function must know how to interpret the variable arguments list. With the printf() or scanf() functions, the format string tells the function what to expect. The simplest technique is to pass an explicit count of the other arguments (which are normally all the same ...

Use the following steps to create a topic: Click Create New Topic on the tag's dashboard. Name the topic. Provide detailed examples in the "Examples" section. If you have more to share, use the "Syntax," "Parameters," and "Remarks" sections. You have ...

A topic is made up of several sections: Title: What is the subject of the topic. Search existing topics first to make sure you are not repeating content that already exists. Topics already covered elsewhere on Stack Overflow may be deleted. Versions: The versions where the material covered by the ...