How Can You Store Both String and Int Values in a Go Struct?

Storing Both String and Int Values in a Go Struct

In Go, it's not possible to store both string and int values directly in a single struct field. This is due to the language's strong type system, which requires variables to have specific, well-defined types.

Possible Solutions

To work around this limitation, you have a few options:

1. Convert the Input Dynamically: You can convert the int input to a string when needed and convert it back to int when processing.
2. Define Multiple Structs: You can define separate structs for different input types, such as testCaseString and testCaseInt.
3. Interface Implementation: As of Go 1.18, you can use interfaces as a workaround. While Go does not have native sum types, it does allow you to define interfaces that multiple types can implement.

Interface Implementation in Go 1.18 and Beyond

Using an interface, you can create a type that can hold both string and int values. Here's an example:

type Input interface {
    IsValid() bool
    Value() interface{}
}

type TestCaseBool struct {
    input   bool
    isValid bool
}

func (tc TestCaseBool) IsValid() bool {
    return tc.isValid
}

func (tc TestCaseBool) Value() interface{} {
    return tc.input
}

You can now use the TestCaseBool struct to hold either a boolean value or an empty interface.

Note: This solution requires Go 1.18 or higher to work.

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