CODEWITHSUNDEEP
gointerface
卓琮偉
卓琮偉

Reputation: 179

Golang: A map Interface, how to print key and value

I get a map interface, like :

getUsersAppInfo := usersAppInfo.GetUsersAppInfo(getUserId)

then I print :

fmt.Println(getUsersAppInfo)

get this, like :

[map[appId:2 fcmServerKey:keyTestTest name:com.app]]

Ask : How to just print the value, like

appId value is 2 
name value is com.app 
fcmServerKey:keyTestTest value is keyTestTest

Upvotes: 12

Views: 87120

Answers (4)

yakob abada
yakob abada

Reputation: 1287

I have found this useful.

https://github.com/yakob-abada/go-api

import "github.com/k0kubun/pp/v3"

m := map[string]string{"foo": "bar", "hello": "world"}
pp.Print(m)

enter image description here

Upvotes: 0

poWar
poWar

Reputation: 825

I don't recommend to do this in production setup. But when I want to print out a map without too much code on my dev box, i print the JSON serialised version. This will be a crime to do in production. 

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    a := map[string]interface{}{"appId": 2, "fcmServerKey": "keyTestTest", "name": "com.app", "version": []int{1, 2, 3}, "xyz": 3}
    bs, _ := json.Marshal(a)
    fmt.Println(string(bs))
}

Output:

{"appId":2,"fcmServerKey":"keyTestTest","name":"com.app","version":[1,2,3],"xyz":3}

Upvotes: 17

user13631587
user13631587

Reputation:

The OP's comment on the question states that type of getUsersAppInfo is []map[string]interface{}.

Loop over the slice of maps. For each map, loop over the keys and values and print.

// loop over elements of slice
for _, m := range getUsersAppInfo {

    // m is a map[string]interface.
    // loop over keys and values in the map.
    for k, v := range m {
        fmt.Println(k, "value is", v)
    }
}

Run this on the GoLang PlayGround.

Upvotes: 23

mprivat
mprivat

Reputation: 21902

I'm afraid the only option is to iterate through the map:

getUsersAppInfo := map[string]interface{}{"foo": 3, "bar": "baz"}
for key, value := range getUsersAppInfo {
    fmt.Printf("%s value is %v\n", key, value)
}

Upvotes: 4

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