Map Declaration and Initialization
We can declare an empty map using the make()
function. Below is the syntax we need to follow:
var mapName = make(map[keyType]valueType)
// or
mapName := make(map[keyType]valueType)
Here, mapName
is the name of the map, keyType
is the expected type of the keys, and valueType
is the expected type of the values. The term map
is a keyword.
We can declare a map called courseData
with keys of type string
and values of type int
.
index.go
1var courseData = make(map[string]int)
If we attempt to output this map, we will receive an output indicating an empty map:
index.
1fmt.Println(courseData) // Output: map[]
We can initialize a map with some data using the following syntax:
var mapName = map[keyType]valueType = {
key1: value1,
key2: value2,
key3: value 3,
…
}
Note
You can place or omit spaces in the map declaration syntax; therefore, both
map[keyType]valueType
andmap [keyType] valueType
are valid.
Using the above syntax, we can create a map that has some initial data in it:
index.go
1234567myMap := map[string]int { "a": 10, "b": 11, "c": 12, } fmt.Println(myMap) // Output: map[a:10 b:11 c:12]
Bedankt voor je feedback!
Vraag AI
Vraag AI
Vraag wat u wilt of probeer een van de voorgestelde vragen om onze chat te starten.
Awesome!
Completion rate improved to 1.96
Map Declaration and Initialization
Veeg om het menu te tonen
We can declare an empty map using the make()
function. Below is the syntax we need to follow:
var mapName = make(map[keyType]valueType)
// or
mapName := make(map[keyType]valueType)
Here, mapName
is the name of the map, keyType
is the expected type of the keys, and valueType
is the expected type of the values. The term map
is a keyword.
We can declare a map called courseData
with keys of type string
and values of type int
.
index.go
1var courseData = make(map[string]int)
If we attempt to output this map, we will receive an output indicating an empty map:
index.
1fmt.Println(courseData) // Output: map[]
We can initialize a map with some data using the following syntax:
var mapName = map[keyType]valueType = {
key1: value1,
key2: value2,
key3: value 3,
…
}
Note
You can place or omit spaces in the map declaration syntax; therefore, both
map[keyType]valueType
andmap [keyType] valueType
are valid.
Using the above syntax, we can create a map that has some initial data in it:
index.go
1234567myMap := map[string]int { "a": 10, "b": 11, "c": 12, } fmt.Println(myMap) // Output: map[a:10 b:11 c:12]
Bedankt voor je feedback!