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feat(set): [#51] SetBuilder returns a copy of the Set #52

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feat(set): [#51] SetBuilder returns a copy of the Set #52

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8 changes: 8 additions & 0 deletions sets.go
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,14 @@ func NewSetBuilder[T any](hasher Hasher[T]) *SetBuilder[T] {
return &SetBuilder[T]{s: NewSet(hasher)}
}

// ToSet returns returns the current copy of the set.
// The builder should not be used again after the list after this call.
func (s SetBuilder[T]) ToSet() Set[T] {
set := s.s
s.s = Set[T]{}
return set
}

func (s SetBuilder[T]) Set(val T) {
s.s.m = s.s.m.set(val, struct{}{}, true)
}
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24 changes: 24 additions & 0 deletions sets_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,30 @@ func TestSetsDelete(t *testing.T) {
}
}

func TestSetBuilder(t *testing.T) {
b := NewSetBuilder[string](nil)
b.Set("test3")
b.Set("test1")
b.Set("test2")

s := b.ToSet()
if s.Len() != 3 {
t.Fatalf("Set has wrong number of items")
}
if !s.Has("test1") {
t.Fatalf("Missing item test1")
}
if !s.Has("test2") {
t.Fatalf("Missing item test2")
}
if !s.Has("test3") {
t.Fatalf("Missing item test3")
}
if s.Has("test4") {
t.Fatalf("Unexpected item test4")
}
}

func TestSortedSetsPut(t *testing.T) {
s := NewSortedSet[string](nil)
s2 := s.Add("1").Add("1").Add("0")
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