How to Pass a Slice of One Interface to a Function Expecting a Slice of a Compatible but Different Interface in Go?

Passing an Interface Slice to a Different Compatible Interface Slice

In Go, you may encounter a challenge when attempting to pass a slice of an interface to a function that expects a slice of a different but compatible interface. While single items can be passed successfully, slices of the original interface may fail.

For instance, if you have two interfaces, A and B, where A includes B, and a concrete implementation of A that also satisfies B, you may encounter this issue. Passing an individual item of type A to a function expecting io.Reader will work, but attempting to pass a slice of A to a function expecting []io.Reader will fail.

This is because Go is a statically typed language and doesn't allow for implicit type conversions. To resolve this issue, you must create a new slice of the expected type and assign elements from the original slice manually. In the example provided, the error message suggests that []A cannot be assigned directly to []io.Reader.

Therefore, the recommended solution is to create a new slice of []io.Reader and copy elements from the []A slice manually. This ensures that the function receives the correct type of slice as expected.

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