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18 lines
453 B
18 lines
453 B
7 years ago
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package groups
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// Filter filters out any groups of given that are not in required. Thus it may
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// happen that the resulting slice is empty.
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func Filter(given, required []string) []string {
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groups := []string{}
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groupFilter := make(map[string]struct{})
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for _, group := range required {
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groupFilter[group] = struct{}{}
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}
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for _, group := range given {
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if _, ok := groupFilter[group]; ok {
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groups = append(groups, group)
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}
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}
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return groups
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}
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