Right pattern for returning slice of structs from function in golang

Question

I'm relatively new to go and just trying to figure out what the right pattern is for returning a collection of structs from a function in go. See the code below, I have been returning a slice of structs which then gets problematic when trying to iterate over it since I have to use an interface type. See the example:

package main import ( "fmt" ) type SomeStruct struct { Name string URL string StatusCode int } func main() { something := doSomething() fmt.Println(something) // iterate over things here but not possible because can't range on interface{} // would like to do something like //for z := range something { // doStuff(z.Name) //} } func doSomething() interface{} { ServicesSlice := []interface{}{} ServicesSlice = append(ServicesSlice, SomeStruct{"somename1", "someurl1", 200}) ServicesSlice = append(ServicesSlice, SomeStruct{"somename2", "someurl2", 500}) return ServicesSlice }

From what I have read, everything seems to use type switch or ValueOf with reflect to get the specific value. I think I'm just missing something here, as I feel passing data back and forth should be fairly straight forward.

user94559 · Accepted Answer · 2016-07-16 19:49:27Z

You just need to return the right type. Right now, you're returning interface{}, so you'd need to use a type assertion to get back to the actual type you want, but you can just change the function signature and return []SomeStruct (a slice of SomeStructs):

package main import ( "fmt" ) type SomeStruct struct { Name string URL string StatusCode int } func main() { something := doSomething() fmt.Println(something) for _, thing := range something { fmt.Println(thing.Name) } } func doSomething() []SomeStruct { ServicesSlice := make([]SomeStruct, 0, 2) ServicesSlice = append(ServicesSlice, SomeStruct{"somename1", "someurl1", 200}) ServicesSlice = append(ServicesSlice, SomeStruct{"somename2", "someurl2", 500}) return ServicesSlice }

https://play.golang.org/p/TdNQTYciTk

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