React JS- Important Methods Used

React JS- Important Methods Used.

There are several basic methods that are commonly used in React applications:

• render(): This is the method that is called to render the component’s JSX to the DOM. It should return a single parent element that contains all of the JSX elements.
• componentDidMount(): This is a lifecycle method that is called after the component has been mounted to the DOM. It is often used to perform side effects, such as fetching data from an API or setting up event listeners.
• shouldComponentUpdate(): This is a lifecycle method that is called before the component is re-rendered. It receives the next set of props and state as arguments, and it should return a boolean value indicating whether the component should be re-rendered.
• componentDidUpdate(): This is a lifecycle method that is called after the component has been updated. It is often used to perform side effects, such as making an API call or updating the state of another component.
• setState(): This is a method that is used to update the component’s state. It accepts an object or a function that returns an object, and it schedules an update to the component’s state. The component will be re-rendered after the update is applied.
• useState(): This is a hook that is used to add state to functional components. It returns an array with two elements: the current state value and a function that can be used to update the state.
• constructor(props): This is a special method that is called when a new instance of a component is created. It is used to initialize the component’s state and bind event handlers to the component.
• componentWillUnmount(): This is a lifecycle method that is called before the component is unmounted and destroyed. It is often used to perform cleanup tasks, such as canceling network requests or removing event listeners.
• getDerivedStateFromProps(props, state): This is a static lifecycle method that is called before the component is re-rendered. It receives the next set of props and the current state as arguments, and it should return an object to update the state, or null if the state should not be updated.
• getSnapshotBeforeUpdate(prevProps, prevState): This is a lifecycle method that is called right before the changes from the update are applied to the DOM. It receives the previous props and state as arguments, and it should return a value that will be passed as the third argument to componentDidUpdate().
• useEffect(effect, dependencies): This is a hook that is used to perform side effects in a functional component. The effect argument is a function that contains the side effect code, and the dependencies argument is an array of values that the effect depends on. The effect will be called after the component is rendered and whenever one of the values in the dependencies array changes.
• useContext(context): This is a hook that is used to consume context in a functional component. It receives a context object as an argument and returns the current context value for that context.
• useReducer(reducer, initialState, init): This is a hook that is used to add state management to a functional component. It receives a reducer function, an initial state, and an optional initialization function as arguments, and it returns the current state and a dispatch function that can be used to update the state.
• useCallback(callback, dependencies): This is a hook that is used to optimize the performance of a functional component. It returns a memoized version of the callback function that only changes if one of the values in the dependencies array changes.
• useMemo(compute, dependencies): This is a hook that is used to optimize the performance of a functional component. It returns a memoized value that is computed using the compute function and that only changes if one of the values in the dependencies array changes.
• useRef(initialValue): This is a hook that is used to store a mutable value in a functional component. It returns a mutable ref object whose .current property is initialized to the initialValue argument.