efritz/ij

package util

// ContainsAll determines if sup is a superset of sub. The
// first return value is a flag, and the second is the set
// of values which are missing from sup.
func ContainsAll(sup, sub []string) (bool, []string) {
    hash := map[string]struct{}{}
    for _, val := range sup {
        hash[val] = struct{}{}
    }

    missing := []string{}
    for _, val := range sub {
        if _, ok := hash[val]; !ok {
            missing = append(missing, val)
        }
    }

    return len(missing) == 0, missing
}