chore: use more standard library functions

Author: twpayne

generator.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"maps"
 	"os"
+	"slices"
 	"strings"
 
 	"github.com/goccy/go-yaml"
@@ -264,9 +265,8 @@ func (g *Generator) Generate() ([]byte, error) {
 		useJSONNumber:            g.useJSONNumber,
 	})
 	if len(imports) > 0 {
-		importsSlice := sortedKeys(imports)
 		fmt.Fprintf(buffer, "import (\n")
-		for _, _import := range importsSlice {
+		for _, _import := range slices.Sorted(maps.Keys(imports)) {
 			fmt.Fprintf(buffer, "\"%s\"\n", _import)
 		}
 		fmt.Fprintf(buffer, ")\n")

jsonstruct_test.go

@@ -1,6 +1,8 @@
 package jsonstruct
 
 import (
+	"maps"
+	"slices"
 	"testing"
 
 	"github.com/alecthomas/assert/v2"
@@ -22,7 +24,7 @@ func TestDefaultExportNameFunc(t *testing.T) {
 		"123":              "_123",
 		"A|B":              "A_B",
 	}
-	for _, name := range sortedKeys(expected) {
+	for _, name := range slices.Sorted(maps.Keys(expected)) {
 		t.Run(name, func(t *testing.T) {
 			assert.Equal(t, expected[name], DefaultExportNameFunc(name, defaultAbbreviations))
 		})

maps.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"maps"
+	"slices"
 	"strings"
 	"time"
 
@@ -273,10 +275,9 @@ func (v *value) goType(observations int, options *generateOptions) goType {
 			}
 		}
 		b := &bytes.Buffer{}
-		properties := sortedKeys(v.objectProperties)
 		fmt.Fprintf(b, "struct {\n")
 		var unparsableProperties []string
-		for _, property := range properties {
+		for _, property := range slices.Sorted(maps.Keys(v.objectProperties)) {
 			if isUnparsableProperty(property) {
 				unparsableProperties = append(unparsableProperties, property)
 				continue