如何在golang中转换或移位slice中的值？

Question

I have a slice in golang, say [1 2 3 4 5 6 7 8 9 10], and I would like to efficiently shift the values to different indexes such as a shift of 5 would yield [6 7 8 9 10 1 2 3 4 5].

I have come up with a solution below, but wondering if there is a built-in or better way to accomplish this?

https://play.golang.org/p/tkYPkGmffQ1

Answer 1

func translation(nums []int, n int) []int {
    n = n % len(nums)
    return append(nums[n:len(nums):len(nums)], nums[:n]...)
}

is sufficient.

nums[n:len(nums):len(nums)] is a "full slice expression" which ensures that the resulting slice has no excess capacity (even if nums does). Since it has 0 extra capacity, append will have to allocate a new array to place the extra items, and the returned slice won't be an alias of the original slice — unless n is 0. If you need to handle the case of 0, then you can do it with a copy.