slices/map.go

package slices

func Map[I, O any](slice []I, mapper func(I) O) []O {
	ret := make([]O, 0, len(slice))
	for _, v := range slice {
		ret = append(ret, mapper(v))
	}
	return ret
}

func MapError[I, O any](slice []I, mapper func(I) (O, error)) ([]O, error) {
	ret := make([]O, 0, len(slice))
	for _, old := range slice {
		new, err := mapper(old)
		if err != nil {
			return nil, err
		}
		ret = append(ret, new)
	}
	return ret, nil
}