get_updates.go

package main

type Updates struct {
	New []Pokemon
}

func getPokemonUIDs(pokemons []Pokemon) []string {
	var uids []string
	for _, pokemon := range pokemons {
		uids = append(uids, pokemon.UID())
	}
	return uids
}

func contains(arr []string, item string) bool {
	for _, value := range arr {
		if value == item {
			return true
		}
	}
	return false
}

func GetUpdates(previous, current []Pokemon) Updates {
	previousUIDs := getPokemonUIDs(previous)
	var currentUIDs []string
	var new []Pokemon
	for _, pokemon := range current {
		// Only if the pokemon hasn't been seen yet
		// And while we're at it, de-dupe the ones with the same UIDs
		if !contains(previousUIDs, pokemon.UID()) && !contains(currentUIDs, pokemon.UID()) {
			new = append(new, pokemon)
			currentUIDs = append(currentUIDs, pokemon.UID())
		}
	}
	return Updates{new}
}