diff --git a/duration_slice.go b/duration_slice.go
index badadda5..3fd55e09 100644
--- a/duration_slice.go
+++ b/duration_slice.go
@@ -1,7 +1,6 @@
 package pflag
 
 import (
-	"fmt"
 	"strings"
 	"time"
 )
@@ -46,7 +45,7 @@ func (s *durationSliceValue) Type() string {
 func (s *durationSliceValue) String() string {
 	out := make([]string, len(*s.value))
 	for i, d := range *s.value {
-		out[i] = fmt.Sprintf("%s", d)
+		out[i] =d.String()
 	}
 	return "[" + strings.Join(out, ",") + "]"
 }
@@ -56,7 +55,7 @@ func (s *durationSliceValue) fromString(val string) (time.Duration, error) {
 }
 
 func (s *durationSliceValue) toString(val time.Duration) string {
-	return fmt.Sprintf("%s", val)
+	return val.String()
 }
 
 func (s *durationSliceValue) Append(val string) error {
diff --git a/ipnet_slice_test.go b/ipnet_slice_test.go
index 11644c58..1161b3e7 100644
--- a/ipnet_slice_test.go
+++ b/ipnet_slice_test.go
@@ -13,10 +13,7 @@ func getCIDR(ip net.IP, cidr *net.IPNet, err error) net.IPNet {
 }
 
 func equalCIDR(c1 net.IPNet, c2 net.IPNet) bool {
-	if c1.String() == c2.String() {
-		return true
-	}
-	return false
+	return c1.String() == c2.String()
 }
 
 func setUpIPNetFlagSet(ipsp *[]net.IPNet) *FlagSet {
diff --git a/string_array.go b/string_array.go
index d1ff0a96..2404407f 100644
--- a/string_array.go
+++ b/string_array.go
@@ -30,18 +30,14 @@ func (s *stringArrayValue) Append(val string) error {
 
 func (s *stringArrayValue) Replace(val []string) error {
 	out := make([]string, len(val))
-	for i, d := range val {
-		out[i] = d
-	}
+	copy(out, val)
 	*s.value = out
 	return nil
 }
 
 func (s *stringArrayValue) GetSlice() []string {
 	out := make([]string, len(*s.value))
-	for i, d := range *s.value {
-		out[i] = d
-	}
+	copy(out, *s.value)
 	return out
 }