What Is The This Keyword?

How does the this keyword work provide some code examples?

“this” Refers to a New Instance When a function is invoked with the new keyword, then the function is known as a constructor function and returns a new instance.

In such cases, the value of this refers to a newly created instance.

For example: In the case of person..

What is this in HTML?

Each time the function is called, this refers to the HTML element that is currently handling the event, the HTML element that “owns” the copy of doSomething() .

What is the correct way of placing this keyword in a constructor?

Invoke current class constructor Here, ‘this’ keyword calls the constructor with the String parameter. So, when the constructor with a String and an int called this(n) ( constructor with a String ), firstly, n was assigned to name ( in the first constructor ) and then b was assigned to balance.

What is the friend function in C++?

In object-oriented programming, a friend function, that is a “friend” of a given class, is a function that is given the same access as methods to private and protected data. A friend function is declared by the class that is granting access, so friend functions are part of the class interface, like methods.

Is Main a keyword in C++?

The keyword main is a prime example, and others include things like the endl manipulator and other keywords from the vast collection of C++ libraries. … The difference is that else is a reserved word, while main is “only” a predefined identifier.

What is this keyword in JS?

The JavaScript this keyword refers to the object it belongs to. … In a function, this refers to the global object. In a function, in strict mode, this is undefined . In an event, this refers to the element that received the event. Methods like call() , and apply() can refer this to any object.

What is === operator?

The strict equality operator ( === ) checks whether its two operands are equal, returning a Boolean result. Unlike the equality operator, the strict equality operator always considers operands of different types to be different.

What is the use of this operator?

Keyword ‘THIS’ in Java is a reference variable that refers to the current object. “this” is a reference to the current object, whose method is being called upon. You can use “this” keyword to avoid naming conflicts in the method/constructor of your instance/object.

What is strict mode?

Strict Mode was a new feature in ECMAScript 5 that allows you to place a program, or a function, in a “strict” operating context. This strict context prevents certain actions from being taken and throws more exceptions. … Strict mode prohibits some syntax likely to be defined in future versions of ECMAScript.

What is super () in Java?

The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.

Can we override static method?

Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.

What do you mean by this keyword?

The this keyword refers to the current object in a method or constructor. The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter).

What is the meaning of the keyword this and how can the keyword be used check all that apply?

What is the meaning of the keyword ‘this’, and how can the keyword be used? Check all that apply. –It is used to call one constructor from another. –It can be used to access or set an object’s field values.

What are the six ways to use this keyword?

What are the 6 ways to use this keyword in Java?this can be used to get the current object.this can be used to invoke current object’s method.this() can be used to invoke current class constructor.this can be passed as a parameter to a method call.this can be passed as a parameter to a constructor.this can be used to return the current object from the method.

What is the use of this keyword in C++?

In C++ programming, this is a keyword that refers to the current instance of the class. There can be 3 main usage of this keyword in C++. It can be used to pass current object as a parameter to another method. It can be used to refer current class instance variable.