Swift porting of Dart List.generate method

list_generate.swift

extension Array<Any> {
    static func generate<T>(_ length: Int, _ generator: (_ index: Int) -> T) -> [T] {
        return (0...length).map { (index) in generator(index) }
    }
}

//Usage
Array.generate(5, { index in return Int.random(in: 0...5) }) //[3, 2, 4, 1, 5]
Array.generate(5, { index in return "Element \(index)" }) //["Element 0", "Element 1", ...]