generics_example.go

package main

import "fmt"

/*
A function that received an array and a value
and returns true if the array contains the value
and false if the value is missing.
*/

//non-generic one
func ContainsInt(items []int, item int) bool {
	for _, v := range items {
		if v == item {
			return true
		}
	}
	return false
}

//make it generic. Types should be able to "compare"
//between themselves.
func Contains[T comparable](items []T, item T) bool {
	for _, v := range items {
		if v == item {
			return true
		}
	}
	return false
}

func main() {
	fmt.Println(Contains[string]([]string{"boo", "far"}, "bar")) //false
	fmt.Println(Contains[string]([]string{"boo", "far"}, "far")) //true
}