Golang - Accessing a deep nested value from a map in Go

go_get_nested_value.go

package main

import (
	"errors"
	"fmt"
)

func GetNestedValue(m map[string]any, keys ...string) (any, error) {
	if len(keys) == 0 {
		return nil, errors.New("no keys provided")
	}

	var value any = m
	for _, key := range keys {
		switch v := value.(type) {
		case map[string]any:
			value = v[key]
		default:
			return nil, errors.New("key path not found")
		}
	}

	return value, nil
}

func main() {
	// Example nested map
	nestedMap := map[string]any{
		"level1": map[string]any{
			"level2": map[string]any{
				"level3": "target_value",
			},
		},
	}

	value, err := GetNestedValue(nestedMap, "level1", "level2", "level3")
	if err != nil {
		fmt.Println("Error:", err)
	} else {
		fmt.Println("Value:", value)
	}
}