Golang : Map within a map example



Tags : golang map array

Just an example of map within map in Golang. The example below demonstrates how to put declare a map with map and how to access the elements.

Putting this down here for my own future reference.

Here we go!


 package main

 import (
  "fmt"
 )

 func main() {

  hits := map[string]map[string]string{
 "#$h-ma": map[string]string{
 "AggregatorA0": "counterA0",
 "AggregatorA1": "counterA1",
 "AggregatorA2": "counterA2",
 "AggregatorA3": "counterA3",
 },
 "#$h-mb": map[string]string{
 "AggregatorB0":  "counterB0",
 "AggregatorB1n": "counterB1",
 },
 "#$h-mc": map[string]string{
 "AggregatorC0": "counterC0",
 },
  }

  // accessing the elements in map within map
  fmt.Println(hits["#$h-mb"]["AggregatorBn"]) // empty
  fmt.Println(hits["#$h-mb"]["AggregatorB1n"]) // counterB1

  fmt.Println(hits["#$h-ma"]) // show all
  fmt.Println(hits["#$h-ma"]["AggregatorA1"]) // counterA1
  

 // show all
  fmt.Println(hits)
 }

Output:

counterB1

map[AggregatorA0:counterA0 AggregatorA1:counterA1 AggregatorA2:counterA2 AggregatorA3:counterA3]

counterA1

map[#$h-ma:map[AggregatorA2:counterA2 AggregatorA3:counterA3 AggregatorA0:counterA0 AggregatorA1:counterA1] #$h-mb:map[AggregatorB0:counterB0 AggregatorB1n:counterB1] #$h-mc:map[AggregatorC0:counterC0]]

  See also : Golang : Extract or copy items from map based on value



Tags : golang map array

By Adam Ng

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