Using trailing closure in for-in loop

Question

I\'m using map() function of array in for-in loop like this:

let numbers = [2, 4, 6, 8, 10]

for doubled in numbers.map { $0 * 2 } // compile error
         


        

Answer 1

The syntax is ambiguous (see dasblinkenlight's answer). For an alternative syntax:

let numbers = [2, 4, 6, 8, 10]

numbers.map { $0 * 2 }.forEach {
    print(doubled)
}

or

let numbers = [2, 4, 6, 8, 10]
let doubledNumbers = numbers.map { $0 * 2 }

for doubled in doubledNumbers {
    print(doubled)
}