railpack

1package plan2 3type Spreadable interface {4	IsSpread() bool5}6 7type StringWrapper struct {8	Value string9}10 11func (s StringWrapper) IsSpread() bool {12	return s.Value == "..."13}14 15func Spread[T Spreadable](left []T, right []T) []T {16	if left == nil {17		return right18	}19 20	result := make([]T, 0, len(left)+len(right))21 22	for _, val := range left {23		if val.IsSpread() {24			result = append(result, right...)25		} else {26			result = append(result, val)27		}28	}29 30	return result31}32 33func SpreadStrings(left []string, right []string) []string {34	if left == nil {35		return right36	}37 38	result := make([]string, 0, len(left)+len(right))39 40	for _, val := range left {41		if val == "..." {42			result = append(result, right...)43		} else {44			result = append(result, val)45		}46	}47 48	return result49}50