Can you demonstrate how to access the fourth element of a slice?

In Go, access to slice elements is done through an index in square brackets, starting from 0.

To get the fourth element of a slice, you need to access index 3:

package main

import "fmt"

func main() {
    s := []int{10, 20, 30, 40, 50}
    fourth := s[3] // index 3 is the fourth element
    fmt.Println(fourth) // Will print: 40
}

It is important to ensure that the length of the slice is at least 4, otherwise an "index out of range" panic will occur.