How do I use the array filter method in JavaScript?

How do I use the array filter method in JavaScript?

The array filter method creates a new array with all elements that pass the test implemented by the provided function. You can use it like this: const newArray = array.filter(element => condition);

Can you give me an example of filtering an array of numbers?

Sure! Here's an example: const numbers = [1, 2, 3, 4, 5]; const evenNumbers = numbers.filter(num => num % 2 === 0); // evenNumbers will be [2, 4].

What if I want to filter objects in an array?

You can filter objects similarly. For example: const users = [{name: 'Alice', age: 25}, {name: 'Bob', age: 20}]; const adults = users.filter(user => user.age >= 21); // adults will be [{name: 'Alice', age: 25}].

Are there any performance considerations when using filter?

Yes, using filter on large arrays can impact performance. It's important to consider the size of the array and the complexity of the condition function.