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Example demonstrates usage of map in go. Click here to learn more
func main() {
/* Uncomment this code block and verify that program will give
* runtime error as Map is not initialized
var alphabets map[string]string
alphabets["A"] = "Apple"
fmt.Println(alphabets)
*/
//Initializing Map
//variation #1
var alphabets map[string]string
alphabets = make(map[string]string)
alphabets["A"] = "Apple"
alphabets["B"] = "Ball"
alphabets["C"] = "Cat"
fmt.Println(alphabets)
//variation #2
players := make(map[int]string)
players[1] = "Sachin"
players[2] = "Virat"
players[3] = "Dhoni"
fmt.Println(players)
//variation #3
signs := map[string]string{
"=": "equalto",
"+": "plus",
}
fmt.Println(signs)
//If provided key is not present then map will return zero value
fmt.Println(signs["-"])
//There is another way which is provided by Go which returns two
//values one is value & other is whether operation is successful
//or not
value, isSuccessful := signs["-"]
fmt.Println(value, isSuccessful)
if value, isSuccessful := signs["+"]; isSuccessful {
fmt.Println(value)
}
//Iterating Over Map
//Variation #1
for key, value := range alphabets {
fmt.Println(key, value)
}
//Variation #2
for key := range players {
fmt.Println(players[key])
}
}
map[B:Ball C:Cat A:Apple]
map[1:Sachin 2:Virat 3:Dhoni]
map[=:equalto +:plus]
false
plus
A Apple
B Ball
C Cat
Sachin
Virat
Dhoni
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