Merge pull request #35 from gochore/dev

.travis.yml

@@ -1,8 +1,8 @@
 language: go
 
 go:
-  - 1.14.x
   - 1.15.x
+  - 1.16.x
 
 before_install:
   - go get -t -v ./...

cmd/generate/gen_x_seq.go.tmpl

@@ -295,7 +295,14 @@ func (s *{{.Name}}Seq) Range(interval Interval) *{{.Name}}Seq {
 	return new{{.Name}}Seq(slice)
 }
 
-// Range returns a *{{.Name}}Seq without elements which make fn returns true
+// Slice returns a sub *{{.Name}}Seq with specified index
+func (s *{{.Name}}Seq) Slice(i, j int) *{{.Name}}Seq {
+	sslice := s.getSlice()
+	slice := sslice[i:j]
+	return new{{.Name}}Seq(slice)
+}
+
+// Trim returns a *{{.Name}}Seq without elements which make fn returns true
 func (s *{{.Name}}Seq) Trim(fn func(i int, v {{.Name}}) bool) *{{.Name}}Seq {
 	sslice := s.getSlice()
 	if fn == nil || len(sslice) == 0 {

cmd/generate/gen_x_seq_test.go.tmpl

@@ -46,6 +46,7 @@ func Test{{.Name}}Seq_NilSafe(t *testing.T) {
 	seq.Last()
 	seq.Percentile(0.5)
 	seq.Range(Interval{})
+	seq.Slice(0, 0)
 	seq.Trim(func(i int, v {{.Name}}) bool {
 		return false
 	})
@@ -675,6 +676,40 @@ func Test{{.Name}}Seq_Range(t *testing.T) {
 	}
 }
 
+func Test{{.Name}}Seq_Slice(t *testing.T) {
+	data := Random{{.Name}}s(100)
+	Sort(data)
+
+	type args struct {
+		i int
+		j int
+	}
+	tests := []struct {
+		name string
+		data {{.Name}}s
+		args args
+		want {{.Name}}s
+	}{
+		{
+			name: "regular",
+			data: data,
+			args: args{
+				i: 1,
+				j: 3,
+			},
+			want: data[1:3],
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := new{{.Name}}Seq(data)
+			if got := s.Slice(tt.args.i, tt.args.j).{{.Name}}s(); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Slice() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
 func Test{{.Name}}Seq_Trim(t *testing.T) {
 	data := Random{{.Name}}s(10)
 	Sort(data)