Recursively find a value in a JSON object that can contain fields and values, as long as all values are only JSON objects with similarly defined objects with fields and values.

traverse.go

// traverse recursively finds a value in a JSON object that can contain fields and values,
// as long as all values are only JSON objects with similarly defined objects with fields and values.
// This works with structures like the US and International Street APIs.
// example: traverse(d, "components", "primary_number) // will return the primary number of the candidate)
func traverse(i interface{}, keys ...string) interface{} {
	var (
		found  bool
		object map[string]interface{}
	)
	object, found = i.(map[string]interface{})
	if !found {
		return nil
	}
	for x, key := range keys {
		if x < len(keys)-1 {
			object, found = object[key].(map[string]interface{})
			if !found {
				return nil
			}
		} else {
			i, found = object[key]
			if found {
				return i
			}
		}
	}
	return nil
}