feat: add Merge function

slice/slice.go

@@ -618,6 +618,17 @@ func UnionBy[T any, V comparable](predicate func(item T) V, slices ...[]T) []T {
 	return result
 }
 
+// Merge all given slices into one slice
+func Merge[T any](slices ...[]T) []T {
+	result := make([]T, 0)
+
+	for _, item := range slices {
+		result = append(result, item...)
+	}
+
+	return result
+}
+
 // Intersection creates a slice of unique values that included by all slices.
 func Intersection[T comparable](slices ...[]T) []T {
 	if len(slices) == 0 {

slice/slice_test.go

@@ -446,6 +446,18 @@ func TestUnionBy(t *testing.T) {
 	assert.Equal(result, []int{0, 2, 4, 10})
 }
 
+func TestMerge(t *testing.T) {
+	assert := internal.NewAssert(t, "TestMerge")
+
+	s1 := []int{1, 2, 3, 4}
+	s2 := []int{2, 3, 4, 5}
+	s3 := []int{4, 5, 6}
+
+	assert.Equal([]int{1, 2, 3, 4, 2, 3, 4, 5, 4, 5, 6}, Merge(s1, s2, s3))
+	assert.Equal([]int{1, 2, 3, 4, 2, 3, 4, 5}, Merge(s1, s2))
+	assert.Equal([]int{2, 3, 4, 5, 4, 5, 6}, Merge(s2, s3))
+}
+
 func TestIntersection(t *testing.T) {
 	s1 := []int{1, 2, 2, 3}
 	s2 := []int{1, 2, 3, 4}