Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære Map Declaration and Initialization | Intro to Structs & Maps
Introduction to GoLang

bookMap 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

index.go

copy

              
1

            
var courseData = make(map[string]int)

If we attempt to output this map, we will receive an output indicating an empty map:

index.

index.

copy

              
1

            
fmt.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 and map [keyType] valueType are valid.

Using the above syntax, we can create a map that has some initial data in it:

index.go

index.go

copy

              
1234567

            
myMap := map[string]int {
	"a": 10,
	"b": 11,
	"c": 12,
}

fmt.Println(myMap) // Output: map[a:10 b:11 c:12]
question mark

Which syntax is correct for creating a new empty map?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 6. Kapitel 5

Spørg AI

expand

Spørg AI

ChatGPT

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

Awesome!

Completion rate improved to 1.96

bookMap Declaration and Initialization

Stryg for at vise menuen

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

index.go

copy

              
1

            
var courseData = make(map[string]int)

If we attempt to output this map, we will receive an output indicating an empty map:

index.

index.

copy

              
1

            
fmt.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 and map [keyType] valueType are valid.

Using the above syntax, we can create a map that has some initial data in it:

index.go

index.go

copy

              
1234567

            
myMap := map[string]int {
	"a": 10,
	"b": 11,
	"c": 12,
}

fmt.Println(myMap) // Output: map[a:10 b:11 c:12]
question mark

Which syntax is correct for creating a new empty map?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 6. Kapitel 5
some-alt