Golang generic Contains function https://blog.golang.org/generics-next-step

main.go

package main

import (
	"fmt"
)

func Contains(type T comparable)(elems []T, target T) bool {
	for _, elem := range elems {
		if elem == target {
			return true
		}
	}
	return false
}

func main() {
	fmt.Println(Contains([]int{1, 2, 3, 4, 5}, 4))
	fmt.Println(Contains([]string{"a", "b", "c"}, "a"))
}