refactor(set): pop method randomly removes an element and return (#202)

datastructure/set/set.go

@@ -187,10 +187,11 @@ func (s Set[T]) EachWithBreak(iteratee func(item T) bool) {
 // Pop delete the top element of set then return it, if set is empty, return nil-value of T and false.
 func (s Set[T]) Pop() (v T, ok bool) {
 	if len(s) > 0 {
-		items := s.Values()
-		item := items[len(s)-1]
-		delete(s, item)
-		return item, true
+		for item := range s {
+			v = item
+			delete(s, item)
+			return v, true
+		}
 	}
 
 	return v, false

datastructure/set/set_test.go

@@ -243,25 +243,34 @@ func TestEachWithBreak(t *testing.T) {
 	// assert.Equal(6, sum)
 }
 
-// func TestPop(t *testing.T) {
-// 	assert := internal.NewAssert(t, "TestPop")
+func TestPop(t *testing.T) {
+	t.Parallel()
+	assert := internal.NewAssert(t, "TestSet_Pop")
+
+	s := New[int]()
+
+	val, ok := s.Pop()
+	assert.Equal(0, val)
+	assert.Equal(false, ok)
 
-// 	s := New[int]()
+	s = New(1, 2, 3, 4, 5)
+	sl := s.ToSlice()
 
-// 	val, ok := s.Pop()
-// 	assert.Equal(0, val)
-// 	assert.Equal(false, ok)
+	val, ok = s.Pop()
+	assert.Equal(false, s.Contain(val))
+	assert.Equal(true, ok)
+	assert.Equal(len(sl)-1, s.Size())
 
-// 	s.Add(1)
-// 	s.Add(2)
-// 	s.Add(3)
+	var found bool
 
-// 	// s = New(1, 2, 3, 4, 5)
+	for _, v := range sl {
+		if v == val {
+			found = true
+		}
+	}
 
-// 	val, ok = s.Pop()
-// 	assert.Equal(3, val)
-// 	assert.Equal(true, ok)
-// }
+	assert.Equal(true, found)
+}
 
 func TestSet_ToSlice(t *testing.T) {
 	t.Parallel()