How can I chain filter with other array methods in JavaScript?

How can I chain filter with other array methods in JavaScript?

You can chain the filter method with other array methods like map and reduce. For example, you can first filter an array to get specific items and then map over the filtered results to transform them.

Can you show me a code example of that?

Sure! Here's an example:

const numbers = [1, 2, 3, 4, 5, 6];
const evenSquares = numbers.filter(num => num % 2 === 0).map(num => num * num);
console.log(evenSquares); // Output: [4, 16, 36]

What if I want to use reduce instead of map?

You can use reduce to accumulate values. Here's how you can do it:

const sumOfEvenSquares = numbers.filter(num => num % 2 === 0).reduce((acc, num) => acc + num * num, 0);
console.log(sumOfEvenSquares); // Output: 56