Manoj Kumar Duraisamy
Explain the Map usage in react and give an example for the same.

Explain the Map usage in react and give an example for the same.

By Manoj Kumar Duraisamy in React on Jan 07 2023
  • Abhishek Khandare
    Jan, 2023 15

    In React, the map() method is used to iterate over an array of elements and create a new array with the same number of elements, but with modified values. The map() method takes a callback function as an argument, which is called for each element in the array, and the return value of the callback function is used to create a new element in the new array.Here is an example of how to use the map() method in a React component to display a list of items: import React from 'react';class MyComponent extends React.Component {constructor(props) {super(props);this.state = {items: [{ id: 1, name: 'Item 1' },{ id: 2, name: 'Item 2' },{ id: 3, name: 'Item 3' }]};}render() {return (

      {this.state.items.map(item => (
    • {item.name}
    • ))}
    );} }export default MyComponent;In the above example, the map() method is called on the items array in the component's state, and for each item in the array, it creates a new
  • element with the item's name. The key prop is passed to each
  • element, which is used by React to keep track of each element in the list.The map method return an array so you can use it to create a new array of elements, using the return value of the callback function, or to update the values of the existing array without creating a new one.It's important to mention that when you use map method you should include a unique key for each element, as it helps React to keep track of the elements and make re-rendering more efficient.

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