How to build and manipulate custom type information dynamically using reflection in Golang?

To build and manipulate custom type information dynamically using reflection in Golang, you can follow these steps:

Import the reflect package: In order to use the reflection library, you need to import the reflect package.

import "reflect"

Create a type dynamically: You can create a new type dynamically using the reflect.StructOf function. It takes a slice of reflect.StructField as a parameter, which defines the fields of the struct.

typeInfo := []reflect.StructField{
    {
        Name: "Field1",
        Type: reflect.TypeOf(0),
    },
    {
        Name: "Field2",
        Type: reflect.TypeOf(""),
    },
}

newType := reflect.StructOf(typeInfo)

Create an instance of the dynamically created type: Once you have the type, you can create an instance of it using the reflect.New function.

instance := reflect.New(newType).Elem()

Manipulate the instance: You can manipulate the instance using reflection. You can access and set field values using the FieldByName or Field method on the reflect value.

field1Val := instance.FieldByName("Field1")
field1Val.SetInt(42)

field2Val := instance.Field(1)
field2Val.SetString("Hello, World!")

Get the value of the struct: Finally, you can extract the value from the reflect instance using the Interface method.

value := instance.Interface()

These are the basic steps to build and manipulate custom type information dynamically using reflection in Golang. Keep in mind that reflection can be slower than regular code and should be used judiciously.