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set.go
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set.go
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package imdb
import (
"fmt"
"strings"
)
type void struct{}
type set struct {
elements map[interface{}]void
}
// NewSet returns an empty set.
func NewSet() *set {
return &set{make(map[interface{}]void)}
}
// Len returns number of elements in the set.
func (s *set) Len() int {
return len(s.elements)
}
// Has checks if set has the element.
func (s *set) Has(e interface{}) bool {
_, ok := s.elements[e]
return ok
}
// Add adds an element to the set.
func (s *set) Add(e interface{}) {
s.elements[e] = void{}
}
// Remove removes an element from the set.
func (s *set) Remove(e interface{}) {
delete(s.elements, e)
}
// All returns all elements of the set.
func (s *set) All() []interface{} {
elements := make([]interface{}, 0, len(s.elements))
for element := range s.elements {
elements = append(elements, element)
}
return elements
}
// String returns string representation of the set.
func (s *set) String() string {
arr := make([]string, 0, len(s.elements))
for element := range s.elements {
arr = append(arr, fmt.Sprint(element))
}
return fmt.Sprintf("{%s}", strings.Join(arr, ", "))
}