Initialize a nested map

[Archos]

Is correct to use a nested map like this one? If so, how is
initialized?

var pointers map[int]map[int][]string

[Jan Mercl]

On Wednesday, January 11, 2012 12:11:49 PM UTC+1, Archos wrote:

Is correct to use a nested map like this one?

Don't know if correct, but valid it is.

 

If so, how is
initialized?

var pointers map[int]map[int][]string

E.g.: http://goo.gl/Vs0xt 

[kortschak]

package main

import "fmt"

func main() {
outer := make(map[int]map[int][]string)
outer[1] = make(map[int][]string)
outer[1][2] = []string{} // or equivalent

fmt.Println(outer)

[Archos]

My failure is that I wasn't initializing the slice, in my code. Thanks
to both!

[Sam Nardoni]

While correct, it might be worth breaking it down in to smaller chunks:

type int2strings map[int][]string
map[int]int2strings

[o...@streamrail.com]

+1 for using types.

By the way, there's a nice nested data structures golang tutorial here:

https://github.com/StefanSchroeder/Golang-NestedDatastructures-Tutorial/blob/master/chapter04.markdown

[carrie....@gmail.com]

This is so helpful, even in 2020.  Thank you!