How To Use Array In React JS

Websolutionstuff | Aug-12-2022 | Categories : React JS

In this article, we will see how to use an array in React JS. We can use the JavaScript standard Array functions in React JS. We can see react loop array example in the render. Also, we are using the map() method. map() creates a new array from calling a function for every array element. map() calls a function once for each element in an array. map() does not execute the function for empty elements.

So, let's see how to access array elements in React JS or how to render an array of components React JS.

Iterate String Array:

we will see how to loop through the Array and display it in the UI.

Create a new String Array using the below code in your index.html file.

const myArray = ['Laravel', 'PHP', 'Node JS', 'React JS', 'jQuery'];

The Array contains the list of items. We can iterate and display the Array in the UI using map() function.

<!DOCTYPE html>
<html>
    <head>
        <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
        <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
        <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    </head>
    <body>

        <div id="mydiv"></div>

        <script type="text/babel">      

          function Hello() {  
         
          const myArray = ['Laravel', 'PHP', 'Node JS', 'React JS', 'jQuery'];  
            
          return (  
            <div className="container">     
                <h1> How To Use Array In React JS - Websolutionstuff</h1>  
             
                {myArray.map(name => (  
                  <li>  
                    {name}  
                  </li>  
                ))}  
             
            </div>  
          );  
        }
          
        ReactDOM.render(<Hello />, document.getElementById('mydiv'))

        </script>
    </body>
</html>

Output:

Read Also: How To Create React JS Application

Iterate Array Of Objects:

how to loop through the array of objects. It is similar to the String Array example.

<!DOCTYPE html>
<html>
    <head>
        <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
        <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
        <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    </head>
    <body>

        <div id="mydiv"></div>

        <script type="text/babel">      

        function Hello() {  

            const tdstyle = {  
              border:"1px solid black",
              padding:"15px",
            };
       
            const myArray =  [  
                {  
                    'id': 1,   
                    'name': 'Laravel',
                    'website': 'https://laravel.com/'
                },  
                {  
                    'id': 2,   
                    'name': 'React JS',   
                    'website': 'https://reactjs.org/'
                },  
                {  
                    'id': 3,   
                    'name': 'jQuery',
                    'website': 'https://jquery.com/'
                },  
            ];  
            
            return (  
            <div className="container">     
                <h1> How To Use Array In React JS </h1>  
             
                <table style={{borderCollapse:"collapse"}}>  
                    <tr>  
                        <th>ID</th>  
                        <th>Name</th>  
                        <th>Website</th>  
                    </tr>  
            
                    {myArray.map((myArray, index) => (  
                      <tr data-index={index}>  
                        <td style={tdstyle}>{myArray.id}</td>  
                        <td style={tdstyle}>{myArray.name}</td>  
                        <td style={tdstyle}>{myArray.website}</td>  
                      </tr>  
                    ))}  
            
                </table>   
             
            </div>  
          );  
        }
          
        ReactDOM.render(<Hello />, document.getElementById('mydiv'))

        </script>
    </body>
</html>

Output: