How to Efficiently Convert Go Maps to Structs?

Converting Maps to Structs in Go

Question:

How can we efficiently convert a map with string keys and interface{} values into a corresponding struct?

Answer:

There are two primary approaches:

Using mapstructure:

• Pros: Simple and efficient.
• Cons: Requires an external library (github.com/mitchellh/mapstructure).

import "github.com/mitchellh/mapstructure"

mapstructure.Decode(myData, &result)

Custom Implementation:

• Pros: No external dependencies.
• Cons: More complex and error-prone.

func SetField(obj interface{}, name string, value interface{}) error {
    // Logic for setting the field value
}

func (s *MyStruct) FillStruct(m map[string]interface{}) error {
    // Iterate over the map and set the struct fields
}

// Example usage
func main() {
    result := &MyStruct{}
    err := result.FillStruct(myData)
    if err != nil {
        fmt.Println(err)
    }
}

Note:

Both approaches assume that the struct field names match the map keys, and the values are of the correct type. Handling these cases requires additional code.

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