diff --git a/slice/contains.go b/slice/contains.go
index 36469f6..25e064a 100644
--- a/slice/contains.go
+++ b/slice/contains.go
@@ -36,7 +36,6 @@ func ContainsString(sl []string, v string) bool {
 	return false
 }
 
-
 func ContainsSlice(smallSlice, bigSlice []string) bool {
 	for i := 0; i < len(smallSlice); i++ {
 		if !ContainsString(bigSlice, smallSlice[i]) {
diff --git a/str/ids.go b/str/ids.go
index e4be082..25a1aa3 100644
--- a/str/ids.go
+++ b/str/ids.go
@@ -6,12 +6,24 @@ import (
 	"strings"
 )
 
-func IdsInt64(ids string) []int64 {
+func IdsInt64(ids string, sep ...string) []int64 {
 	if ids == "" {
 		return []int64{}
 	}
 
-	arr := strings.Split(ids, ",")
+	s := ","
+	if len(sep) > 0 {
+		s = sep[0]
+	}
+
+	var arr []string
+
+	if s == " " {
+		arr = strings.Fields(ids)
+	} else {
+		arr = strings.Split(ids, s)
+	}
+
 	count := len(arr)
 	ret := make([]int64, 0, count)
 	for i := 0; i < count; i++ {
@@ -26,11 +38,16 @@ func IdsInt64(ids string) []int64 {
 	return ret
 }
 
-func IdsString(ids []int64) string {
+func IdsString(ids []int64, sep ...string) string {
 	count := len(ids)
 	arr := make([]string, count)
 	for i := 0; i < count; i++ {
-		arr[i] = fmt.Sprintf("%d", ids[i])
+		arr[i] = fmt.Sprint(ids[i])
+	}
+
+	if len(sep) > 0 {
+		return strings.Join(arr, sep[0])
 	}
+
 	return strings.Join(arr, ",")
 }
diff --git a/str/str.go b/str/str.go
index 8948618..8112319 100644
--- a/str/str.go
+++ b/str/str.go
@@ -19,4 +19,4 @@ func TrimStringSlice(raw []string) []string {
 	}
 
 	return arr
-}
\ No newline at end of file
+}