Golang : Map within a map example
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
By Adam Ng
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