Add MapSlice.Keys, MapSlice.KeysString, and MapSlice.Values methods.

README.md

@@ -10,6 +10,8 @@ Go MapSlice for ordered marshal/ unmarshal of maps in JSON
 
 # Example
 
+https://go.dev/play/p/wzWP5vufCvL
+
 ```go
 package main
 

example_test.go

@@ -0,0 +1,100 @@
+package mapslice_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+
+	"github.com/ake-persson/mapslice-json"
+)
+
+func main() {
+	ms := mapslice.MapSlice{
+		mapslice.MapItem{Key: "abc", Value: 123},
+		mapslice.MapItem{Key: "def", Value: 456},
+		mapslice.MapItem{Key: "ghi", Value: 789},
+	}
+
+	b, err := json.Marshal(ms)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(b))
+
+	ms = mapslice.MapSlice{}
+	if err := json.Unmarshal(b, &ms); err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println(ms)
+}
+
+func ExampleMapSlice_MarshalJSON() {
+	ms := mapslice.MapSlice{
+		mapslice.MapItem{Key: "abc", Value: 123},
+		mapslice.MapItem{Key: "def", Value: 456},
+		mapslice.MapItem{Key: "ghi", Value: 789},
+	}
+
+	b, err := json.Marshal(ms)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("%s", b)
+
+	// Output:
+	// {"abc":123,"def":456,"ghi":789}
+}
+
+func ExampleMapSlice_UnmarshalJSON() {
+	var ms = mapslice.MapSlice{}
+
+	if err := json.Unmarshal([]byte(`{"abc":123,"def":456,"ghi":789}`), &ms); err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("%s", ms)
+
+	// Output:
+	// [{abc 123} {def 456} {ghi 789}]
+}
+
+func ExampleMapSlice_Keys() {
+	ms := mapslice.MapSlice{
+		mapslice.MapItem{Key: "abc", Value: 123},
+		mapslice.MapItem{Key: "def", Value: 456},
+		mapslice.MapItem{Key: "ghi", Value: 789},
+	}
+
+	fmt.Println(ms.Keys())
+
+	// Output:
+	// [abc def ghi]
+}
+
+func ExampleMapSlice_KeysString() {
+	ms := mapslice.MapSlice{
+		mapslice.MapItem{Key: "abc", Value: 123},
+		mapslice.MapItem{Key: "def", Value: 456},
+		mapslice.MapItem{Key: "ghi", Value: 789},
+	}
+
+	fmt.Println(ms.Keys())
+
+	// Output:
+	// [abc def ghi]
+}
+
+func ExampleMapSlice_Values() {
+	ms := mapslice.MapSlice{
+		mapslice.MapItem{Key: "abc", Value: 123},
+		mapslice.MapItem{Key: "def", Value: 456},
+		mapslice.MapItem{Key: "ghi", Value: 789},
+	}
+
+	fmt.Println(ms.Values())
+
+	// Output:
+	// [123 456 789]
+}

mapslice.go

@@ -27,6 +27,33 @@ func nextIndex() uint64 {
 	return indexCounter
 }
 
+// Keys returns a MapSlice's Keys in a slice.
+func (ms MapSlice) Keys() []interface{} {
+	s := make([]interface{}, len(ms))
+	for i, k := range ms {
+		s[i] = k.Key
+	}
+	return s
+}
+
+// KeysString returns MapSlice's Keys as []string.
+func (ms MapSlice) KeysString() []string {
+	s := make([]string, len(ms))
+	for i, k := range ms {
+		s[i] = fmt.Sprintf("%s", k.Key)
+	}
+	return s
+}
+
+// Values returns a MapSlice's values in a slice.
+func (ms MapSlice) Values() []interface{} {
+	s := make([]interface{}, len(ms))
+	for i, k := range ms {
+		s[i] = k.Value
+	}
+	return s
+}
+
 // MapItem as a string.
 func (mi MapItem) String() string {
 	return fmt.Sprintf("{%v %v}", mi.Key, mi.Value)

mapslice_test.go

@@ -18,7 +18,7 @@ func TestMarshal(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	e := "{\"abc\":123,\"def\":456,\"ghi\":789}"
+	e := `{"abc":123,"def":456,"ghi":789}`
 	r := string(b)
 
 	if r != e {
@@ -39,7 +39,7 @@ func TestMarshalError(t *testing.T) {
 
 func TestUnmarshal(t *testing.T) {
 	ms := MapSlice{}
-	if err := json.Unmarshal([]byte("{\"abc\":123,\"def\":456,\"ghi\":789}"), &ms); err != nil {
+	if err := json.Unmarshal([]byte(`{"abc":123,"def":456,"ghi":789}`), &ms); err != nil {
 		t.Fatal(err)
 	}