Multiline Function Chains

Chained function calls should be either on the same line, or one per line

• Identifier: multiline_function_chains
• Enabled by default: No
• Supports autocorrection: No
• Kind: style
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

let evenSquaresSum = [20, 17, 35, 4].filter { $0 % 2 == 0 }.map { $0 * $0 }.reduce(0, +)

let evenSquaresSum = [20, 17, 35, 4]
    .filter { $0 % 2 == 0 }.map { $0 * $0 }.reduce(0, +)",

let chain = a
    .b(1, 2, 3)
    .c { blah in
        print(blah)
    }
    .d()

let chain = a.b(1, 2, 3)
    .c { blah in
        print(blah)
    }
    .d()

let chain = a.b(1, 2, 3)
    .c { blah in print(blah) }
    .d()

let chain = a.b(1, 2, 3)
    .c(.init(
        a: 1,
        b, 2,
        c, 3))
    .d()

self.viewModel.outputs.postContextualNotification
  .observeForUI()
  .observeValues {
    NotificationCenter.default.post(
      Notification(
        name: .ksr_showNotificationsDialog,
        userInfo: [UserInfoKeys.context: PushNotificationDialog.Context.pledge,
                   UserInfoKeys.viewController: self]
     )
    )
  }

let remainingIDs = Array(Set(self.currentIDs).subtracting(Set(response.ids)))

self.happeningNewsletterOn = self.updateCurrentUser
    .map { $0.newsletters.happening }.skipNil().skipRepeats()

Triggering Examples

let evenSquaresSum = [20, 17, 35, 4]
    .filter { $0 % 2 == 0 }↓.map { $0 * $0 }
    .reduce(0, +)

let evenSquaresSum = a.b(1, 2, 3)
    .c { blah in
        print(blah)
    }↓.d()

let evenSquaresSum = a.b(1, 2, 3)
    .c(2, 3, 4)↓.d()

let evenSquaresSum = a.b(1, 2, 3)↓.c { blah in
        print(blah)
    }
    .d()

a.b {
//  ““
}↓.e()