Prefer using .first(where:) over .filter { }.first in collections SW-P1007

Using .first(where:) instead of .filter { }.first in collections, can result in cleaner and more efficient code.

When using .filter { }.first on a collection, it has to traverse the entire collection and create a new array with the filtered elements before returning the first one. This means that if the collection is large, this approach can have a significant performance impact.

On the other hand, .first(where:) returns the first element that satisfies the condition without creating an intermediate array. It stops traversing the collection as soon as it finds a matching element, resulting in improved performance and less memory usage.

Bad Practice

let numbers = [1, 2, 3, 4, 5]
let firstEven = numbers.filter { $0 % 2 == 0 }.first

Recommended

let numbers = [1, 2, 3, 4, 5]
let firstEven = numbers.first(where: { $0 % 2 == 0 })