Go maps

This program demonstrates Go maps, which are key-value data structures similar to dictionaries or hash maps in other languages. It covers creating maps with make() and literal syntax, reading values by key, adding new entries, deleting entries with delete(), and using the comma-ok idiom to safely check whether a key exists in the map.

func maps()  {

	statePopulation := make(map[string]int)
	statePopulation = map[string]int{
		"California": 2341232,
		"Texas": 3341232,
		"Florida": 4341232,
		"New York": 5341232,
		"Illinois": 6341232,
		"Ohio": 7341232,
	}

	fmt.Printf("State population: %v\n\n", statePopulation)

	fmt.Printf("State California: %v\n", statePopulation["California"])
	fmt.Printf("State Texas: %v\n", statePopulation["Texas"])
	fmt.Printf("State Florida: %v\n", statePopulation["Florida"])
	fmt.Printf("State New York: %v\n", statePopulation["New York"])
	fmt.Printf("State Illinois: %v\n", statePopulation["Illinois"])
	fmt.Printf("State Ohio: %v\n", statePopulation["Ohio"])

	statePopulation["Georgia"] = 11111

	fmt.Printf("Length of map: %v\n", len(statePopulation))

	fmt.Printf("State Ohio: %v\n", statePopulation["Ohio"])

	delete(statePopulation, "Ohio")

	fmt.Printf("State population: %v\n\n", statePopulation)

	// how about if we ask about non existing key ???

	newStatePopulation, ok := statePopulation["xyz"]
	fmt.Printf("The \"xyz\" key is present in map: %v (%v)\n", newStatePopulation, ok)

	_, okk := statePopulation["xtt"]
	fmt.Printf("The \"xyz\" key is present in map: (%v)\n", okk)

}

func main()  {
	// arrays()
	// slices()
	maps()
}