The Filter Method

The filter() method creates a new array with all elements that pass the test implemented by the provided function. It's useful for selecting a subset of elements from an array based on certain criteria.

Basic syntax:

let newArray = arr.filter(function(currentValue, index, array) {
    // return true to keep the element, false otherwise
});

Here's a simple example:

const numbers = [1, 2, 3, 4, 5, 6];
const evenNumbers = numbers.filter(num => num % 2 === 0);
console.log(evenNumbers); // [2, 4, 6]

The filter() method doesn't modify the original array. It returns a new array containing only the elements that passed the test.