nestedmap is a nested map for Go.
nestedmap prevents panic: assignment to entry in nil map and we don't have to worry about map initialization.
nestedmap requires Go 1.18+.
$ go get github.com/arkuchy/nestedmap
package main
import (
"fmt"
"github.com/arkuchy/nestedmap"
)
func main() {
// Initialize nestedmap with type argument
// map[string]map[int]bool
nm := nestedmap.NewNestedMap[string, int, bool]()
// Set value
nm.Set("gopher", 117, false)
nm.Set("gopher", 118, true)
// map[gopher:map[117:false 118:true]]]
// Get outer value. The type is map[int]bool
if m, ok := nm.GetOuter("gopher"); ok {
fmt.Println(m) // output: map[117:true 118:true]
}
// Get inner value. The type is bool
if v, ok := nm.GetInner("gopher", 118); ok {
fmt.Println(v) // output: true
}
// When we try to get non-existing data, ok is false
if v, ok := nm.GetInner("gooopher", 118); ok {
fmt.Println(v) // not called
}
}