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Page 1096 of 2109
Super constructor in Dart Programming
The subclass can inherit the superclass methods and variables, but it cannot inherit the superclass constructor. The superclass constructor can only be invoked with the use of the super() constructor.The super() constructor allows a subclass constructor to explicitly call the no arguments and parametrized constructor of superclass.SyntaxSubclassconstructor():super(){ }Though, it is not even necessary to use the super() keyword as the compiler automatically or implicitly does the same for us.When an object of a new class is created by making use of the new keyword, it invokes the subclass constructor which implicitly invokes the parent class's default constructor.Let's make use of an example where ...
Read MoreSuper keyword in Dart Programming
Super keyword in dart is used to refer to the parent's class object's methods or variables. In simple terms, it is used to refer to the superclass properties and methods.The most important use of the super keyword is to remove the ambiguity between superclass and subclass that have methods and variables with the same name.The super keyword is able to invoke the parent's objects method and fields, as when we create an instance of the subclass in Dart, an instance of the parent class is also created implicitly.Syntaxsuper.varName or super.methodNameAs we can access both the variables and methods of the parent's ...
Read MoreTernary Operator in Dart Programming
The ternary operator is a shorthand version of an if-else condition. There are two types of ternary operator syntax in Dart, one with a null safety check and the other is the same old one we encounter normally.Syntax 1condition ? expressionOne : expressionTwo;The above syntax implies that if a certain condition evaluates to true then we evaluate the expressionOne first and then the expressionTwo.ExampleLet's explore a Dart example where we make use of the above syntax of the ternary operator.Consider the example shown below −void main(){ var ans = 10; ans == 10 ? print("Answer is 10") : ...
Read MoreThis keyword in Dart Programming
This keyword in dart is used to remove the ambiguity that can be caused if the class attributes and the parameters have the same name. This keyword basically represents an implicit object pointing to the current class object.We usually prefix the class attribute with this keyword whenever we want to remove the ambiguity between the class attributes and the parameters.ExampleLet's take two examples of the case where the name of the class attribute and the parameters are the same.Consider the example shown below −void main() { Employee emp = new Employee('001'); emp.empCode = '111'; } class Employee ...
Read MoreHow does the event pattern work in .NET?
Events are a simplified pattern that uses delegates. In C#, all delegates have the multicast capability, i.e., an instance of a delegate can represent not just a single method but a list of methods. For example −Exampledelegate int Transformer(int x); static void Main(){ Transformer perform = x =>{ int result = x * x; Console.WriteLine(result); return result; }; perform += x =>{ int result = x * x * x; Console.WriteLine(result); return result; }; perform(2); // prints ...
Read MoreExplain the stream architecture in .NET
The .NET streams architecture provides a consistent programming interface for reading and writing across different I/O types. It includes classes for manipulating files and directories on disk, as well as specialized streams for compression, named pipes, and memory-mapped files.The streaming architecture in .NET relies on a backing store and adapters.Backing StoreIt represents a store of data, such as a file or a network connection. It can act as either a source from which bytes can be read sequentially or a destination to which bytes can be written sequentially.The Stream class in .NET exposes the backing store to programmers. It exposes ...
Read MoreConstructors in Dart Programming
Constructors are methods that are used to initialize an object when it gets created. Constructors are mainly used to set the initial values for instance variables. The name of the constructor is the same as the name of the class.Constructors are similar to instance methods but they do not have a return type.All classes in Dart have their own default constructor, if you don't create any constructor for a class, the compiler will implicitly create a default constructor for every class by assigning the default values to the member variables.We can create a constructor in Dart something like this −class ...
Read MoreGetter and Setter in Dart Programming
Reading and writing access to objects is very important in any programming language. Getter and Setter are the exact methods that we use when we want to access the reading and writing privileges to an object's properties.SyntaxA getter usually looks something like this -returnType get fieldName { // return the value }The returnType is the type of data we are returning. The get keyword is what tells us and the compiler that is a getter, and then lastly we have the fieldName whose value we are trying to get.A setter usually looks something like this −set fieldName { // set the ...
Read MoreHow to subtract column values from column means in R data frame?
To subtract column values from column means in R data frame, we can follow the below steps −First of all, create a data frame.Then, find the column means using colMeans function.After that, subtract column values from column means.Creating the data frameLet's create a data frame as shown below −> x1 x2 x3 df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − x1 x2 x3 1 54 73 57 2 79 52 92 3 87 51 47 4 13 12 1 5 70 90 19 6 15 99 ...
Read MoreHow to create violin plot for categories with grey color palette using ggplot2 in R?
To create violin plot for categories with grey color palette using ggplot2, we can follow the below steps −First of all, create a data frame.Then, create the violin plot for categories with default color of violins.Create the violin plot for categories with color of violins in grey palette.Creating the data frameLet's create a data frame as shown below −> Group Score df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − Group Score 1 Second 405 2 Third 947 3 First 78 4 ...
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