feat: split string list elem

Author: NgoKimPhu

string.go

@@ -0,0 +1,14 @@
+package kutils
+
+import (
+	"strings"
+)
+
+// SplitListElem split each element in a string list with the given separator
+func SplitListElem(lst []string, sep string) []string {
+	ret := make([]string, 0, len(lst))
+	for _, elem := range lst {
+		ret = append(ret, strings.Split(elem, sep)...)
+	}
+	return ret
+}

string_test.go

@@ -0,0 +1,89 @@
+package kutils
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var (
+	sep              = ","
+	splitElem        = strings.Repeat("0", 40)
+	splittableElem   = splitElem + sep + splitElem + sep + splitElem
+	strSplitInMiddle = []string{splitElem, splitElem, splittableElem, splitElem, splittableElem}
+	strNoSplit       = []string{splitElem, splitElem, splitElem, splitElem, splitElem}
+	strAllSplittable = []string{splittableElem, splittableElem, splittableElem, splittableElem}
+)
+
+// BenchmarkSplitListElem/split_in_middle
+// BenchmarkSplitListElem/split_in_middle-16                3464385               3
+// 39.5 ns/op vs 51.0 ns/op using strings.Contains
+// BenchmarkSplitListElem/no_split
+// BenchmarkSplitListElem/no_split-16                       5432838               2
+// 22.2 ns/op vs 67.71 ns/op using strings.Contains
+// BenchmarkSplitListElem/all_splittable
+// BenchmarkSplitListElem/all_splittable-16                 2987763               3
+// 95.3 ns/op vs 16.8 ns/op using strings.Contains
+func BenchmarkSplitListElem(b *testing.B) {
+	b.ResetTimer()
+	b.Run("split in middle", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			SplitListElem(strSplitInMiddle, sep)
+		}
+	})
+	b.Run("no split", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			SplitListElem(strNoSplit, sep)
+		}
+	})
+	b.Run("all splittable", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			SplitListElem(strAllSplittable, sep)
+		}
+	})
+}
+
+func TestSplitListElem(t *testing.T) {
+	type args struct {
+		lst []string
+		sep string
+	}
+	tests := []struct {
+		name string
+		args args
+		want []string
+	}{
+		{
+			"split in middle",
+			args{
+				lst: strSplitInMiddle,
+				sep: sep,
+			},
+			[]string{splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem},
+		},
+		{
+			"no split",
+			args{
+				lst: strNoSplit,
+				sep: sep,
+			},
+			[]string{splitElem, splitElem, splitElem, splitElem, splitElem},
+		},
+		{
+			"split in middle",
+			args{
+				lst: strAllSplittable,
+				sep: sep,
+			},
+			[]string{splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem, splitElem,
+				splitElem, splitElem, splitElem},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equalf(t, tt.want, SplitListElem(tt.args.lst, tt.args.sep), "SplitListElem(%v, %v)", tt.args.lst,
+				tt.args.sep)
+		})
+	}
+}