Is there a way to write generic code to find out whether a slice contains specific element in Go?

Question

I want to know is there a generic way to write code to judge whether a slice contains an element, I find it will frequently useful since there is a lot of logic to fist judg

Answer 1

You can make it using the reflect package like that:

func In(s, e interface{}) bool {
    slice, elem := reflect.ValueOf(s), reflect.ValueOf(e)
    for i := 0; i < slice.Len(); i++ {
        if reflect.DeepEqual(slice.Index(i).Interface(), elem.Interface()) {
            return true
        }
    }
    return false
}

Playground examples: http://play.golang.org/p/TQrmwIk6B4

Alternatively, you can:

• define an interface and make your slices implement it
• use maps instead of slices
• just write a simple for loop

What way to choose depends on the problem you are solving.