all: adopt slices helpers

cmd/headscale/cli/root.go

@@ -3,6 +3,7 @@ package cli
 import (
 	"os"
 	"runtime"
+	"slices"
 	"strings"
 
 	"github.com/juanfont/headscale/hscontrol/types"
@@ -95,13 +96,9 @@ func initConfig() {
 var prereleases = []string{"alpha", "beta", "rc", "dev"}
 
 func isPreReleaseVersion(version string) bool {
-	for _, unstable := range prereleases {
-		if strings.Contains(version, unstable) {
-			return true
-		}
-	}
-
-	return false
+	return slices.ContainsFunc(prereleases, func(unstable string) bool {
+		return strings.Contains(version, unstable)
+	})
 }
 
 // filterPreReleasesIfStable returns a function that filters out

cmd/headscale/cli/utils.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"slices"
 	"time"
 
 	v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
@@ -318,13 +319,9 @@ func printError(err error, outputFormat string) {
 }
 
 func hasMachineOutputFlag() bool {
-	for _, arg := range os.Args {
-		if arg == outputFormatJSON || arg == outputFormatJSONLine || arg == outputFormatYAML {
-			return true
-		}
-	}
-
-	return false
+	return slices.ContainsFunc(os.Args, func(arg string) bool {
+		return arg == outputFormatJSON || arg == outputFormatJSONLine || arg == outputFormatYAML
+	})
 }
 
 type tokenAuth struct {