reduce - Swift - Cleaner Syntax for Reducing an Array inside Guard -

i have uiview driven 2 arrays: [float] "data" , [uicolor] "colors". if view isn't given proper data displaying empty state, controlled guard statement see here:

private func unwrap() -> ([float], [uicolor]) {     guard         let data = data, !data.isempty,         let colors = colors, data.count == colors.count         else { return ([1], [uicolor.lightgray]) } // empty state      let total = data.reduce(0) { $0 + $1 }     if total == 0 { return ([1], [uicolor.lightgray]) }      return (data, colors) } 

i don't repetition of empty state return ([1], [uicolor.lightgray]) being used twice. i've tried add data.reduce call inside guard statement, like:

private func unwrap() -> ([float], [uicolor]) {     guard         let data = data, !data.isempty,         let colors = colors, data.count == colors.count,         data.reduce(0) { $0 + $1 } != 0         else { return ([1], [uicolor.lightgray]) } // empty state      return (data, colors) } 

...the compiler doesn't understand syntax

private func unwrap() -> ([float], [uicolor]) {     guard         let data = data, !data.isempty,         let colors = colors, data.count == colors.count,         let total = data.reduce(0) { $0 + $1 }, total != 0         else { return ([1], [uicolor.lightgray]) } // empty state      return (data, colors) } 

...the result of closure data.reduce(0) { $0 + $1 } isn't optional can't included in guard declaration.

is there cleaner way this?

this simplified version:

private func unwrap() -> ([float], [uicolor]) {     guard let data = data, let colors = colors,         data.count == colors.count, data.reduce(0, +) != 0  else {             return ([1], [uicolor.lightgray])     } // empty state      return (data, colors) } 

reduce can use float's + function, , reduce on empty data array 0, don't need check empty status.