What are some examples of using the map function in JavaScript?

What are some examples of using the map function in JavaScript?

The map function in JavaScript is used to create a new array by applying a function to each element of an existing array. For example, if you have an array of numbers and you want to double each number, you can use map like this:

const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2);
console.log(doubled); // [2, 4, 6, 8]

Can you give me another example?

Sure! Here's another example where we convert an array of strings to uppercase:

const fruits = ['apple', 'banana', 'cherry'];
const uppercasedFruits = fruits.map(fruit => fruit.toUpperCase());
console.log(uppercasedFruits); // ['APPLE', 'BANANA', 'CHERRY']

What if I want to use map with objects?

You can also use map with arrays of objects. For instance, if you have an array of user objects and you want to extract their names:

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