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path: root/go/custom-set/custom_set.go
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package stringset

import "strings"

const testVersion = 3

type Set map[string]struct{}

func New() Set {
	return make(Set)
}

func NewFromSlice(s []string) Set {
	set := make(Set)
	for _, v := range s {
		set[v] = struct{}{}
	}
	return set
}

func (set Set) Add(s string) {
	set[s] = struct{}{}
}

func (set Set) Delete(s string) {
	delete(set, s)
}

func (set Set) Has(s string) bool {
	_, ok := set[s]
	return ok
}

func (set Set) IsEmpty() bool {
	return len(set) == 0
}

func (set Set) Len() int {
	return len(set)
}

func (set Set) Slice() []string {
	tmp := make([]string, 0, len(set))
	for v := range set {
		tmp = append(tmp, v)
	}
	return tmp
}

func (set Set) String() string {
	tmp := make([]string, 0, len(set))
	for v := range set {
		tmp = append(tmp, `"`+v+`"`)
	}
	return `{` + strings.Join(tmp, `, `) + `}`
}

func Equal(s1, s2 Set) bool {
	if len(s1) != len(s2) {
		return false
	}
	for v := range s1 {
		if _, ok := s2[v]; !ok {
			return false
		}
	}
	return true
}

func Subset(s1, s2 Set) bool {
	for v := range s1 {
		if _, ok := s2[v]; !ok {
			return false
		}
	}
	return true
}

func Disjoint(s1, s2 Set) bool {
	for v := range s1 {
		if _, ok := s2[v]; ok {
			return false
		}
	}
	return true
}

func Intersection(s1, s2 Set) Set {
	set := make(Set)
	for v := range s1 {
		if _, ok := s2[v]; ok {
			set[v] = struct{}{}
		}
	}
	return set
}

func Union(s1, s2 Set) Set {
	set := make(Set)
	for v := range s1 {
		set[v] = struct{}{}
	}
	for v := range s2 {
		set[v] = struct{}{}
	}
	return set
}

func Difference(s1, s2 Set) Set {
	set := make(Set)
	for v := range s1 {
		if _, ok := s2[v]; !ok {
			set[v] = struct{}{}
		}
	}
	return set
}

func SymmetricDifference(s1, s2 Set) Set {
	set := make(Set)
	for v := range s1 {
		if _, ok := s2[v]; !ok {
			set[v] = struct{}{}
		}
	}
	for v := range s2 {
		if _, ok := s1[v]; !ok {
			set[v] = struct{}{}
		}
	}
	return set
}