Coollision

func isTrue(t *testing.T, b bool) {
   t.Helper()
   if !b {
      t.Fatal()
   }
}

Coollision

func TestLastIndex(t *testing.T) {
   tableTests := []struct {
      name string
      list []int
      x    int
      want int
   }{
      {name: "singleElement", list: []int{1}, x: 1, want: 0},
      {name: "2timesTheSame", list: []int{1, 1}, x: 1, want: 1},
      {name: "notFound", list: []int{1, 1, 1, 2, 2, 1}, x: 3, want: -1},

Coollision

package main

import "testing"

func TestLastIndex(t *testing.T) {
   list := []int{1, 2, 1, 1}
   if got := lastIndex(list, 2); got != 1 {
      t.Errorf("LastIndex(%v, %v) = %v, want %v", list, 2, got, 1)
   }
}

Coollision

package main

import "fmt"

func main() {
   list := []int{1, 2, 3, 3, 8, 4, 5}

   lastIndexOfFive := LastIndex(list, 5)
   fmt.Printf("the last index of %d in the list %v is: %d",
      5, list, lastIndexOfFive)