Which of the following code is valid as the definition of react lifecycle? A componentDidUpdate(){console.log("Component is updating")) const MyComponent extends React.Component { constructor(props) { super(props) this state = { points: 0] this.handlePoints = this handlePoints.bind(this)]] B shouldComponentUpdate() const MyComponent extends React Component { constructor(props) { super(props) this.state = { points: 0 } this.handlePoints= this.handlePoints.bind(this)}} componentDidMount() const MyComponent extends React.Component(constructor(props) { super(props) this.state = { points: 0 } this.handlePoints = this.handlePoints bind(this)}} D constructor(props) { super(props) this.state = [points: 0] this handlePoints= this.handlePoints.bind(this)}}
Question
Which of the following code is valid as the definition of react lifecycle? A componentDidUpdate(){console.log("Component is updating")) const MyComponent extends React.Component { constructor(props) { super(props) this state = { points: 0] this.handlePoints = this handlePoints.bind(this)]] B shouldComponentUpdate() const MyComponent extends React Component { constructor(props) { super(props) this.state = { points: 0 } this.handlePoints= this.handlePoints.bind(this)}} componentDidMount() const MyComponent extends React.Component(constructor(props) { super(props) this.state = { points: 0 } this.handlePoints = this.handlePoints bind(this)}} D constructor(props) { super(props) this.state = [points: 0] this handlePoints= this.handlePoints.bind(this)}}
Solution
None of the options A, B, C, D are valid definitions of a React lifecycle.
In React, lifecycle methods are special methods that automatically get called as part of the lifecycle of a component. They are used to perform certain actions when the component gets created and inserted into the DOM or when the component updates or unmounts from the DOM.
A typical React component with lifecycle methods looks like this:
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.state = { points: 0 };
this.handlePoints = this.handlePoints.bind(this);
}
componentDidMount() {
console.log("Component has mounted");
}
componentDidUpdate() {
console.log("Component has updated");
}
shouldComponentUpdate() {
console.log("Should component update?");
return true;
}
handlePoints() {
// handle points here
}
render() {
return (
<div>
{/* component layout here */}
</div>
);
}
}
In the provided options, the lifecycle methods are not properly placed inside the component class. They should be methods of the component class, not separate functions or constants. Also, the syntax of the code in the options is incorrect in several places.
Similar Questions
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