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|
package types
type Collection []string
func (c Collection) Intersect(o Collection) Collection {
mo := o.toMap()
result := Collection{}
for _, t := range c {
if mo[t] {
result = append(result, t)
}
}
return result
}
func (c Collection) Remove(o Collection) Collection {
mo := o.toMap()
result := Collection{}
for _, t := range c {
if !mo[t] {
result = append(result, t)
}
}
return result
}
func (c Collection) Union(o Collection) Collection {
ms := c.toMap()
result := []string(c)
for _, oi := range o {
if !ms[oi] {
result = append(result, oi)
}
}
return Collection(result)
}
func (c Collection) toMap() map[string]bool {
m := map[string]bool{}
for _, t := range c {
m[t] = true
}
return m
}
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