Скачать или смотреть constructor in react | constructor in react typescript

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Welcome to this video from tutorialsinhand.com. In this video we are going to discuss on constructors in react

Constructors in React
In class based, object oriented programming language constructor is a special method which is used to declare an object of that class. The constructor gets invoked while creating an object of that class from another class. The constructor might or might not accept arguments to initialize member variables. Unlike member methods, constructors don’t have a return type and supports overloading.


The usage and guidelines for constructor remains quiet same in case of React. But it has to be remembered that constructors are only useful in class components and not in function components. The constructor for a react class is called before the component is mounted.

In React, constructors are mainly used for 2 purpose:
It used for initializing the local state of the react component by assigning an object to “this.state”.
It used for binding event handler methods in React that occur in our component.

super() keyword
Super() function is to call the constructor of the parent class. It is used when we need to access a few variables in the parent class. If we need to use this.props inside the class component’s constructor we need to pass it with the super() function as argument. Otherwise, we don’t want to pass props to super() because we see this.props are available inside the render function.

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