How do I use map and filter together in JavaScript?

How do I use map and filter together in JavaScript?

You can chain the map and filter methods to first filter an array and then transform the filtered results. For example, if you have an array of numbers and you want to double only the even numbers, you can do it like this:

Can you show me a code example?

Sure! Here's a simple example:

const numbers = [1, 2, 3, 4, 5, 6];
const result = numbers.filter(num => num % 2 === 0).map(num => num * 2);
console.log(result); // Output: [4, 8, 12]

What if I want to filter objects instead of numbers?

You can do that too! Just adjust the filter condition based on the object properties. For example:

const users = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];
const result = users.filter(user => user.age > 28).map(user => user.name);
console.log(result); // Output: ['Bob', 'Charlie']