Hands-On High Performance with Go

Map

A map is a kind of container that is used to store key–value pairs. Go's built-in map type uses a hash table to store keys and their associated values.

In Go, instantiating a map is simple, as shown in the following code:

package mainimport "fmt"func main() {    m := make(map[int]string)    m[1] = "car"    m[2] = "train"    m[3] = "plane"    fmt.Println("Full Map:\t ", m)    fmt.Println("m[3] value:\t ", m[3])    fmt.Println("Length of map:\t ", len(m))}

Now let's have a look at the output:

In the preceding execution result, we can see that we can create a map, reference a value in a map by using its key, and find the number of elements in our map using the ...