unifynil, unify nil and empty slices and maps in Golang
Empty slices and maps can be nil or not nil in Go. It may become a nightmare in tests and JSON processing.
This package provides a simple way to convert all empty slices or maps to nil or non-nil versions.
Example
To replace all nil slices and maps to not-nil:
import "github.com/starius/unifynil"
type Response struct {
Items []int `json:"items"`
Users map[string]string `json:"users"`
}
res := &Response{} // Leave the slice and the map nil.
buf, _ := json.Marshal(res)
fmt.Println(string(buf))
// {"items": null, "users": null}
unifynil.Unify(res, unifynil.SliceToEmpty(), unifynil.MapToEmpty())
// Now res.Items = []int{} and res.Users = map[string]string{}.
buf, _ = json.Marshal(res)
fmt.Println(string(buf))
// {"items": [], "users": {}}
Convert back to nils:
unifynil.Unify(res, unifynil.SliceToNil(), unifynil.MapToNil())
// Now res.Items = nil and res.Users = nil.
buf, _ = json.Marshal(res)
fmt.Println(string(buf))
// {"items": null, "users": null}
