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How to create new elements with ReactJS mapping props ?
  • Difficulty Level : Basic
  • Last Updated : 30 Apr, 2021

If we want to create new elements/components using mapping props then we can use the map() function. The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

Following is the example of the map method:

// Sample array
const array1 = [1, 4, 9, 16];

// Pass a function to map
const map1 = array1.map(x => x * 2);

console.log(map1);
// Expected output: Array [2, 8, 18, 32]

We are multiplying each element by two in the same way we can also create elements of each value using the map function.

Creating React Application:

  • Step 1: Create a React application using the following command:



    npx create-react-app foldername
  • Step 2: After creating your project folder i.e. foldername, move to it using the following command:

    cd foldername

Project Structure: It will look like the following.

Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js




import React from 'react'
  
class App extends React.Component {
  
  getComponent = (arr) => {
    return arr.map(value => (
      <button key={value} onClick={() => {
        alert("button " + value + " is clicked")
      }}>{value} </button>
    ))
  }
  
  render() {
    const components = this.getComponent([1, 2, 3, 4, 5]);
    return (
      <div>
        {components}
      </div>
    )
  }
}
  
export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

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