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]valueTypeandmap [keyType] valueTypeare 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]
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Pyyhkäise näyttääksesi valikon
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]valueTypeandmap [keyType] valueTypeare 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]
Kiitos palautteestasi!
