diff --git a/go.mod b/go.mod
index 07d0a13..d4318a0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,17 +1,17 @@
 module go-study
 
-go 1.20
+go 1.23
 
 require (
 	github.com/marusama/cyclicbarrier v1.1.0
 	github.com/stretchr/testify v1.9.0
-	golang.org/x/exp v0.0.0-20240119083558-1b970713d09a
-	golang.org/x/sync v0.5.0
+	go.uber.org/mock v0.5.0
+	golang.org/x/exp v0.0.0-20241108190413-2d47ceb2692f
+	golang.org/x/sync v0.9.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	go.uber.org/mock v0.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 9594462..9951d05 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,26 @@
-github.com/brildum/testify v0.0.0-20151105045740-d05693e2e501 h1:ZWEmkmb/iJoRKLR0YuRP9wnEeF54NT3iUiGNTm/VQrs=
-github.com/brildum/testify v0.0.0-20151105045740-d05693e2e501/go.mod h1:Zpjn5ClomJALLjz5sjBsNW79y3MarfpDcZaSJqbsIwk=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/marusama/cyclicbarrier v1.1.0 h1:ol/AG+sjvh5yz832avbNjaowoerBuD3AgozxL+aD9u0=
 github.com/marusama/cyclicbarrier v1.1.0/go.mod h1:5u93l83cy51YXdz6eKq6kO9+9mGAooB6DHMAxcSuWwQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+go.uber.org/mock v0.4.0 h1:VcM4ZOtdbR4f6VXfiOpwpVJDL6lCReaZ6mw31wqh7KU=
+go.uber.org/mock v0.4.0/go.mod h1:a6FSlNadKUHUa9IP5Vyt1zh4fC7uAwxMutEAscFbkZc=
+go.uber.org/mock v0.5.0 h1:KAMbZvZPyBPWgD14IrIQ38QCyjwpvVVV6K/bHl1IwQU=
+go.uber.org/mock v0.5.0/go.mod h1:ge71pBPLYDk7QIi1LupWxdAykm7KIEFchiOqd6z7qMM=
 golang.org/x/exp v0.0.0-20240119083558-1b970713d09a h1:Q8/wZp0KX97QFTc2ywcOE0YRjZPVIx+MXInMzdvQqcA=
 golang.org/x/exp v0.0.0-20240119083558-1b970713d09a/go.mod h1:idGWGoKP1toJGkd5/ig9ZLuPcZBC3ewk7SzmH0uou08=
+golang.org/x/exp v0.0.0-20241108190413-2d47ceb2692f h1:XdNn9LlyWAhLVp6P/i8QYBW+hlyhrhei9uErw2B5GJo=
+golang.org/x/exp v0.0.0-20241108190413-2d47ceb2692f/go.mod h1:D5SMRVC3C2/4+F/DB1wZsLRnSNimn2Sp/NPsCrsv8ak=
 golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
 golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.9.0 h1:fEo0HyrW1GIgZdpbhCRO0PkJajUS5H9IFUztCgEo2jQ=
+golang.org/x/sync v0.9.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/iterator/set.go b/iterator/set.go
new file mode 100644
index 0000000..e469724
--- /dev/null
+++ b/iterator/set.go
@@ -0,0 +1,52 @@
+package iterator
+
+import (
+	"iter"
+)
+
+type Set[T comparable] struct {
+	ordered []T // 用于保持顺序
+	m       map[T]struct{}
+}
+
+func NewSet[T comparable]() *Set[T] {
+	return &Set[T]{make([]T, 0), make(map[T]struct{})}
+}
+
+func (s *Set[T]) Add(e T) {
+	if !s.Contains(e) {
+		s.ordered = append(s.ordered, e)
+	}
+	s.m[e] = struct{}{}
+}
+
+func (s *Set[T]) Remove(e T) {
+	for k, v := range s.ordered {
+		if v == e {
+			s.ordered = append(s.ordered[:k], s.ordered[k+1:]...)
+			break
+		}
+	}
+
+	delete(s.m, e)
+}
+
+func (s *Set[T]) Contains(e T) bool {
+	_, ok := s.m[e]
+	return ok
+}
+
+func (s *Set[T]) Len() int {
+	return len(s.m)
+}
+
+func (s *Set[T]) All() iter.Seq[T] {
+	return func(yield func(T) bool) {
+		// 迭代有序切片
+		for _, v := range s.ordered {
+			if !yield(v) {
+				return
+			}
+		}
+	}
+}
diff --git a/iterator/set_test.go b/iterator/set_test.go
new file mode 100644
index 0000000..a3ba3b8
--- /dev/null
+++ b/iterator/set_test.go
@@ -0,0 +1,48 @@
+package iterator
+
+import (
+	"github.com/stretchr/testify/assert"
+	"iter"
+	"slices"
+	"testing"
+)
+
+func TestSet(t *testing.T) {
+	s := NewSet[string]()
+	list := []string{
+		"fantasticbin",
+		"phper",
+		"gopher",
+		"javaer",
+	}
+	var pull, push []string
+	expected := list[:3]
+	for v := range slices.Values(list) {
+		s.Add(v)
+	}
+
+	// 只推
+	for v := range s.All() {
+		if v == "javaer" {
+			break
+		}
+		push = append(push, v)
+	}
+
+	// 既推又拉
+	next, stop := iter.Pull(s.All())
+	for {
+		v, ok := next()
+		if !ok {
+			break
+		}
+
+		pull = append(pull, v)
+		if v == "gopher" {
+			stop()
+		}
+	}
+
+	assert.Equal(t, expected, push)
+	assert.Equal(t, expected, pull)
+}