如何对整数Go的切片进行反向排序？

Question

I am trying to reverse-sort a slice of integers in Go.

  example := []int{1,25,3,5,4}
  sort.Ints(example) // this will give me a slice sorted from 1 to the highest number

How do I sort it so that it goes from highest to lowest? so [25 5 4 3 1]

I have tried this

sort.Sort(sort.Reverse(sort.Ints(keys)))

Source: http://golang.org/pkg/sort/#Reverse

However, I am getting the error below

# command-line-arguments
./Roman_Numerals.go:31: sort.Ints(keys) used as value

Answer 1

sort.Ints is a convenient function to sort a couple of ints. Generally you need to implement the sort.Interface interface if you want to sort something and sort.Reverse just returns a different implementation of that interface that redefines the Less method.

Luckily the sort package contains a predefined type called IntSlice that implements sort.Interface:

keys := []int{3, 2, 8, 1}
sort.Sort(sort.Reverse(sort.IntSlice(keys)))
fmt.Println(keys)