swift-snippet-10.swift

extension Array  {

  // it removes the first element that matches the handler condition on the array itself
  public mutating func remove(_ handler: (Element) -> Bool) -> Element? {
    guard let idx = index(where: handler) else { return nil }
    let item = self[idx]
    remove(at: idx)
    return item
  }

  // it removes the first element that matches the handler condition & returns a new array
  public func removed(_ handler: (Element) -> Bool) -> Array {
    var items = self
    items.remove(handler)
    return items
  }
}

Cool extension! 👍 Though, removed should be called removing to match Foundations APIs and to follow Swift's API Design Guidelines.