Maps

Working with map

Create a map without initialization

map1 := make(map[string]int)
fmt.Println("map1: ", map1)

It is possible to use any to accept any type but is more recommended to use struct

map2 := make(map[string]any)
map2["first"] = 1
fmt.Println("map2: ", map2)

here is necessary to run a type assertition
c := int64(map2["first"]) * 2

It is possible to create map inner map

map3 := make(map[string]map[string]int)
map3["inner"] = map[string]int{
	"name": 1,
}
fmt.Println("map3: ", map3)

Go safe map attributes manipulation

As that map is using any type go don't permit the usage of that without a type assertition

That garantes less errors at runtime

error:   
c := int64(map2["first"]) * 2   

Editing map

remove a key

delete(map3, "inner")
// clear map
clear(map3)

maps package has so many fns like maps.Equal()
map keys

map4 := map[string]string{
	"maps":    "maps",
	"structs": "structs",
}
fmt.Println("map4: ", map4)

it returns a seq and is necessary to use slice.Collect to get slice of that

More about Range Over Function Types

fmt.Println("keys4: ", maps.Keys(map4))