Empty Parentheses with Trailing Closure

When using trailing closures, empty parentheses should be avoided after the method call

  • Identifier: empty_parentheses_with_trailing_closure
  • Enabled by default: Yes
  • Supports autocorrection: Yes
  • Kind: style
  • Analyzer rule: No
  • Minimum Swift compiler version: 5.0.0
  • Default configuration:
    KeyValue
    severity warning

Non Triggering Examples

[1, 2].map { $0 + 1 }

[1, 2].map({ $0 + 1 })

[1, 2].reduce(0) { $0 + $1 }

[1, 2].map { number in
 number + 1 
}

let isEmpty = [1, 2].isEmpty()

UIView.animateWithDuration(0.3, animations: {
   self.disableInteractionRightView.alpha = 0
}, completion: { _ in
   ()
})

Triggering Examples

[1, 2].map↓() { $0 + 1 }

[1, 2].map↓( ) { $0 + 1 }

[1, 2].map↓() { number in
 number + 1 
}

[1, 2].map↓(  ) { number in
 number + 1 
}

func foo() -> [Int] {
    return [1, 2].map↓() { $0 + 1 }
}