Swift中数组如何像OC中一样取subarrayWithRange

Swift中数组如何像OC中一样取subarrayWithRange获得子数组呢？

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let a = [1,2,3,4,5,6]
let b = a[2...5]
//b = [3,4,5,6]

如上

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上面获得的是ArraySlice 需要再用Array来包一层

let a = [1,2,3,4,5,6]

let b = a[0...1]

//b is type of ArraySlice

let b= Array(a[0...1])
//b is array