JavaScript map() method

#javascript #webdev #programming #learning

The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

Here's a simple map() example:

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(num => num * 2);

console.log(doubled);

// Output: [2, 4, 6, 8, 10]

Create a JSON File with Car Information and Display Using map()

First, create a JSON file named cars.json:

[
  {
    "name": "Toyota Camry",
    "model": "2023",
    "image": "https://example.com/toyota_camry.jpg"
  },
  {
    "name": "Honda Accord",
    "model": "2022",
    "image": "https://example.com/honda_accord.jpg"
  },
  {
    "name": "Tesla Model 3",
    "model": "2024",
    "image": "https://example.com/tesla_model_3.jpg"
  }
]

create an HTML file index.html and use JavaScript to fetch and display the car information:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Car Display</title>
  <style>
    .car {
      border: 1px solid #ddd;
      padding: 10px;
      margin: 10px;
      text-align: center;
    }
    .car img {
      width: 100px;
      height: auto;
    }
  </style>
</head>
<body>
  <h1>Car Information</h1>
  <div id="car-container"></div>

  <script>
    // Here we have Fetch the car data
    fetch('cars.json')
      .then(response => response.json())
      .then(data => {
        const carContainer = document.getElementById('car-container');
        carContainer.innerHTML = data.map(car => `
          <div class="car">
            <h2>${car.name}</h2>
            <p>Model: ${car.model}</p>
            <img src="${car.image}" alt="${car.name}">
          </div>
        `).join('');
      })
      .catch(error => console.error('Error fetching the car data:', error));
  </script>
</body>
</html>

Make sure to place the cars.json file in the same directory as your HTML file or adjust the fetch URL accordingly

Top comments (5)

Devam Chaudhari • Jul 22 '24

Great article on the map() method ! . I wanted to mention that you can also use destructuring assignment to access the name , model , image properties directly. This way , you don’t have to write cars each time , making the code cleaner and more readable. For example:

cars.map(({name, model, image}) => { });

or
cars.map((cars) => { const {name , model, image}= cars; return () });

Thank you for the insightful content!