How to access properties of interface type parameters without using type assertions in Go language?

Golang interface type parameter attribute access: Avoid type assertions

This article introduces how to access the properties of interface type parameters in Go language without relying on type assertions. The sample code shows that doRun function receives PhoneFoo interface type parameters and needs to access os attributes of IPhoneFoo structure. Direct access to phone.os will cause an error because the interface only defines methods and does not contain structure fields.

The original code tries to access phone.os directly, which is wrong, because the interface only defines methods and cannot directly access fields of the underlying structure. Therefore, other methods need to be used to access os attribute.

This paper uses a reflection mechanism to solve this problem. Reflection allows runtime checking and manipulating object type information. The improved code uses reflect package to implement:

1. reflect.ValueOf(phone) Gets the reflected value of phone interface variable.
2. Since phone is a pointer to the IPhoneFoo structure, call Elem() method to get the value of the structure itself.
3. v.Field(0) gets the first field of the structure (indexed to 0), that is, the os field.
4. fmt.Println(os.String()) or fmt.Println(os) prints the value of the os field. os.Type() prints field type information.

Through reflection, we dynamically obtain and print the os attribute value of the IPhoneFoo structure, avoiding the code redundancy and maintenance problems caused by type assertions. This method is suitable for handling a variety of different types of scenarios with common interfaces.

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