I'getting undefined this error in the constructor. Let me know what is the reason behind this. I read from the sources either compiler automatically creates the constructor and available this reference or need to manually add the constructor with super() as the first statement.
class A extends Component {
constructor() {
// this undefined error
console.log('construtor');
this.state = {name: ''}
}
}
The reason why this cannot be allowed before super() is because this is uninitialized if super() is not called. However even if we are not using this we need a super() inside a constructor because ES6 class constructors MUST call super if they are subclasses. Thus, you have to call super() as long as you have a constructor. (But a subclass does not have to have a constructor).
sending props in super is not mandatory. If you do not want to use this.props then you can simply call super().
class A extends React.Component {
constructor(props) {
super(props);
console.log('construtor');
this.state = {name: ''}
}
}
The subclasses must have super in constructor for initializing purpose. Access of 'this' can't be allowed without super().
class A extends React.Component {
constructor(props) {
super(props);
console.log('construtor');
this.state = { name: ''}
}
}
