How can I flatten an array swiftily in Swift?

Question

I want to turn this:

let x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

into this:

[1, 2, 3, 4, 5, 6, 7, 8, 9]

ver

Answer 1

Flatten function in Array :

let x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
let y = Array(x.flatten())
print(y)

flatMap function in Array :

let x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
let y = x.flatMap({$0})
print(y)

Your Output :

For more : Array in Swift